Merge pull request #1237 from g4jc/css-work

CSS Grid Improvements

46 files changed, 4754 insertions, 861 deletions

diff --git a/layout/base/LayoutConstants.h b/layout/base/LayoutConstants.h
new file mode 100644
index 000000000..cd6e1c3f5
--- /dev/null
+++ b/layout/base/LayoutConstants.h
@@ -0,0 +1,31 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* constants used throughout the Layout module */
+
+#ifndef LayoutConstants_h___
+#define LayoutConstants_h___
+
+#include "nsSize.h"  // for NS_MAXSIZE
+
+/**
+ * Constant used to indicate an unconstrained size.
+ */
+#define NS_UNCONSTRAINEDSIZE NS_MAXSIZE
+
+// NOTE: There are assumptions all over that these have the same value,
+//       namely NS_UNCONSTRAINEDSIZE.
+#define NS_INTRINSICSIZE    NS_UNCONSTRAINEDSIZE
+#define NS_AUTOHEIGHT       NS_UNCONSTRAINEDSIZE
+#define NS_AUTOOFFSET       NS_UNCONSTRAINEDSIZE
+
+// +1 is to avoid clamped huge margin values being processed as auto margins
+#define NS_AUTOMARGIN       (NS_UNCONSTRAINEDSIZE + 1)
+
+#define NS_INTRINSIC_WIDTH_UNKNOWN nscoord_MIN
+
+
+#endif // LayoutConstants_h___
diff --git a/layout/base/moz.build b/layout/base/moz.build
index 4308a6e4d..afc683665 100644
--- a/layout/base/moz.build
+++ b/layout/base/moz.build
@@ -13,6 +13,9 @@ with Files('Display*'):
 with Files('FrameLayerBuilder.*'):
     BUG_COMPONENT = ('Core', 'Layout: View Rendering')
 
+with Files('LayoutConstants.*'):
+    BUG_COMPONENT = ('Core', 'Layout: View Rendering')
+
 with Files('LayerState.*'):
     BUG_COMPONENT = ('Core', 'Layout: View Rendering')
 
@@ -63,6 +66,7 @@ EXPORTS += [
     'FrameLayerBuilder.h',
     'FrameProperties.h',
     'LayerState.h',
+    'LayoutConstants.h',
     'LayoutLogging.h',
     'nsArenaMemoryStats.h',
     'nsBidi.h',
diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index 06690b208..21d20c69f 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -4671,8 +4671,6 @@ GetDefiniteSize(const nsStyleCoord&       aStyle,
         nscoord pb = aIsInlineAxis ? aPercentageBasis.value().ISize(wm)
                                    : aPercentageBasis.value().BSize(wm);
         if (pb == NS_UNCONSTRAINEDSIZE) {
-          // XXXmats given that we're calculating an intrinsic size here,
-          // maybe we should back-compute the calc-size using AddPercents?
           return false;
         }
         *aResult = std::max(0, calc->mLength +
@@ -4916,12 +4914,9 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext,
   nscoord result = aContentSize;
   nscoord min = aContentMinSize;
   nscoord coordOutsideSize = 0;
-  float pctOutsideSize = 0;
-  float pctTotal = 0.0f;
 
   if (!(aFlags & nsLayoutUtils::IGNORE_PADDING)) {
     coordOutsideSize += aOffsets.hPadding;
-    pctOutsideSize += aOffsets.hPctPadding;
   }
 
   coordOutsideSize += aOffsets.hBorder;
@@ -4929,21 +4924,15 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext,
   if (aBoxSizing == StyleBoxSizing::Border) {
     min += coordOutsideSize;
     result = NSCoordSaturatingAdd(result, coordOutsideSize);
-    pctTotal += pctOutsideSize;
 
     coordOutsideSize = 0;
-    pctOutsideSize = 0.0f;
   }
 
   coordOutsideSize += aOffsets.hMargin;
-  pctOutsideSize += aOffsets.hPctMargin;
 
   min += coordOutsideSize;
   result = NSCoordSaturatingAdd(result, coordOutsideSize);
-  pctTotal += pctOutsideSize;
 
-  const bool shouldAddPercent = aType == nsLayoutUtils::PREF_ISIZE ||
-                                (aFlags & nsLayoutUtils::ADD_PERCENTS);
   nscoord size;
   if (aType == nsLayoutUtils::MIN_ISIZE &&
       (((aStyleSize.HasPercent() || aStyleMaxSize.HasPercent()) &&
@@ -4961,18 +4950,6 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext,
              GetIntrinsicCoord(aStyleSize, aRenderingContext, aFrame,
                                PROP_WIDTH, size)) {
     result = size + coordOutsideSize;
-    if (shouldAddPercent) {
-      result = nsLayoutUtils::AddPercents(result, pctOutsideSize);
-    }
-  } else {
-    // NOTE: We could really do a lot better for percents and for some
-    // cases of calc() containing percent (certainly including any where
-    // the coefficient on the percent is positive and there are no max()
-    // expressions).  However, doing better for percents wouldn't be
-    // backwards compatible.
-    if (shouldAddPercent) {
-      result = nsLayoutUtils::AddPercents(result, pctTotal);
-    }
   }
 
   nscoord maxSize = aFixedMaxSize ? *aFixedMaxSize : 0;
@@ -4980,9 +4957,6 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext,
       GetIntrinsicCoord(aStyleMaxSize, aRenderingContext, aFrame,
                         PROP_MAX_WIDTH, maxSize)) {
     maxSize += coordOutsideSize;
-    if (shouldAddPercent) {
-      maxSize = nsLayoutUtils::AddPercents(maxSize, pctOutsideSize);
-    }
     if (result > maxSize) {
       result = maxSize;
     }
@@ -4993,17 +4967,11 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext,
       GetIntrinsicCoord(aStyleMinSize, aRenderingContext, aFrame,
                         PROP_MIN_WIDTH, minSize)) {
     minSize += coordOutsideSize;
-    if (shouldAddPercent) {
-      minSize = nsLayoutUtils::AddPercents(minSize, pctOutsideSize);
-    }
     if (result < minSize) {
       result = minSize;
     }
   }
 
-  if (shouldAddPercent) {
-    min = nsLayoutUtils::AddPercents(min, pctTotal);
-  }
   if (result < min) {
     result = min;
   }
@@ -5020,9 +4988,6 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext,
                                                      : devSize.width);
     // GetMinimumWidgetSize() returns a border-box width.
     themeSize += aOffsets.hMargin;
-    if (shouldAddPercent) {
-      themeSize = nsLayoutUtils::AddPercents(themeSize, aOffsets.hPctMargin);
-    }
     if (themeSize > result || !canOverride) {
       result = themeSize;
     }
@@ -5267,9 +5232,19 @@ nsLayoutUtils::IntrinsicForAxis(PhysicalAxis              aAxis,
     min = aFrame->GetMinISize(aRenderingContext);
   }
 
+  nscoord pmPercentageBasis = NS_UNCONSTRAINEDSIZE;
+  if (aPercentageBasis.isSome()) {
+    // The padding/margin percentage basis is the inline-size in the parent's
+    // writing-mode.
+    auto childWM = aFrame->GetWritingMode();
+    pmPercentageBasis =
+      aFrame->GetParent()->GetWritingMode().IsOrthogonalTo(childWM) ?
+        aPercentageBasis->BSize(childWM) :
+        aPercentageBasis->ISize(childWM);
+  }
   nsIFrame::IntrinsicISizeOffsetData offsets =
-    MOZ_LIKELY(isInlineAxis) ? aFrame->IntrinsicISizeOffsets()
-                             : aFrame->IntrinsicBSizeOffsets();
+    MOZ_LIKELY(isInlineAxis) ? aFrame->IntrinsicISizeOffsets(pmPercentageBasis)
+                             : aFrame->IntrinsicBSizeOffsets(pmPercentageBasis);
   nscoord contentBoxSize = result;
   result = AddIntrinsicSizeOffset(aRenderingContext, aFrame, offsets, aType,
                                   boxSizing, result, min, styleISize,
@@ -5310,11 +5285,12 @@ nsLayoutUtils::IntrinsicForContainer(nsRenderingContext* aRenderingContext,
 }
 
 /* static */ nscoord
-nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis        aAxis,
+nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis       aAxis,
                                           nsRenderingContext* aRC,
-                                          nsIFrame*           aFrame,
-                                          IntrinsicISizeType  aType,
-                                          uint32_t            aFlags)
+                                          nsIFrame*          aFrame,
+                                          IntrinsicISizeType aType,
+                                          const LogicalSize& aPercentageBasis,
+                                          uint32_t           aFlags)
 {
   MOZ_ASSERT(aFrame);
   MOZ_ASSERT(aFrame->IsFlexOrGridItem(),
@@ -5328,9 +5304,7 @@ nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis        aAxis,
                 aWM.IsVertical() ? "vertical" : "horizontal");
 #endif
 
-  // Note: this method is only meant for grid/flex items which always
-  // include percentages in their intrinsic size.
-  aFlags |= nsLayoutUtils::ADD_PERCENTS;
+  // Note: this method is only meant for grid/flex items.
   const nsStylePosition* const stylePos = aFrame->StylePosition();
   const nsStyleCoord* style = aAxis == eAxisHorizontal ? &stylePos->mMinWidth
                                                        : &stylePos->mMinHeight;
@@ -5375,11 +5349,17 @@ nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis        aAxis,
   // wrapping inside of it should not apply font size inflation.
   AutoMaybeDisableFontInflation an(aFrame);
 
-  PhysicalAxis ourInlineAxis =
-    aFrame->GetWritingMode().PhysicalAxis(eLogicalAxisInline);
+  // The padding/margin percentage basis is the inline-size in the parent's
+  // writing-mode.
+  auto childWM = aFrame->GetWritingMode();
+  nscoord pmPercentageBasis =
+    aFrame->GetParent()->GetWritingMode().IsOrthogonalTo(childWM) ?
+      aPercentageBasis.BSize(childWM) :
+      aPercentageBasis.ISize(childWM);
+  PhysicalAxis ourInlineAxis = childWM.PhysicalAxis(eLogicalAxisInline);
   nsIFrame::IntrinsicISizeOffsetData offsets =
-    ourInlineAxis == aAxis ? aFrame->IntrinsicISizeOffsets()
-                           : aFrame->IntrinsicBSizeOffsets();
+    ourInlineAxis == aAxis ? aFrame->IntrinsicISizeOffsets(pmPercentageBasis)
+                           : aFrame->IntrinsicBSizeOffsets(pmPercentageBasis);
   nscoord result = 0;
   nscoord min = 0;
 
diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h
index 0a82dbf6a..bba1f3265 100644
--- a/layout/base/nsLayoutUtils.h
+++ b/layout/base/nsLayoutUtils.h
@@ -6,6 +6,7 @@
 #ifndef nsLayoutUtils_h__
 #define nsLayoutUtils_h__
 
+#include "LayoutConstants.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/Maybe.h"
@@ -154,6 +155,7 @@ public:
   typedef mozilla::ScreenMargin ScreenMargin;
   typedef mozilla::LayoutDeviceIntSize LayoutDeviceIntSize;
   typedef mozilla::StyleGeometryBox StyleGeometryBox;
+  typedef mozilla::LogicalSize LogicalSize;
 
   /**
    * Finds previously assigned ViewID for the given content element, if any.
@@ -1381,7 +1383,8 @@ public:
    * variations if that's what matches aAxis) and its padding, border and margin
    * in the corresponding dimension.
    * @param aPercentageBasis an optional percentage basis (in aFrame's WM).
-   *   Pass NS_UNCONSTRAINEDSIZE if the basis is indefinite in either/both axes.
+   *   If the basis is indefinite in a given axis, pass a size with
+   *   NS_UNCONSTRAINEDSIZE in that component.
    *   If you pass Nothing() a percentage basis will be calculated from aFrame's
    *   ancestors' computed size in the relevant axis, if needed.
    * @param aMarginBoxMinSizeClamp make the result fit within this margin-box
@@ -1395,14 +1398,13 @@ public:
     IGNORE_PADDING = 0x01,
     BAIL_IF_REFLOW_NEEDED = 0x02, // returns NS_INTRINSIC_WIDTH_UNKNOWN if so
     MIN_INTRINSIC_ISIZE = 0x04, // use min-width/height instead of width/height
-    ADD_PERCENTS = 0x08, // apply AddPercents also for MIN_ISIZE
   };
   static nscoord
   IntrinsicForAxis(mozilla::PhysicalAxis aAxis,
                    nsRenderingContext*   aRenderingContext,
                    nsIFrame*             aFrame,
                    IntrinsicISizeType    aType,
-                   const mozilla::Maybe<mozilla::LogicalSize>& aPercentageBasis = mozilla::Nothing(),
+                   const mozilla::Maybe<LogicalSize>& aPercentageBasis = mozilla::Nothing(),
                    uint32_t              aFlags = 0,
                    nscoord               aMarginBoxMinSizeClamp = NS_MAXSIZE);
   /**
@@ -1427,31 +1429,18 @@ public:
    * calculates the result as if the 'min-' computed value is zero.
    * Otherwise, return NS_UNCONSTRAINEDSIZE.
    *
+   * @param aPercentageBasis the percentage basis (in aFrame's WM).
+   *   Pass NS_UNCONSTRAINEDSIZE if the basis is indefinite in either/both axes.
    * @note this behavior is specific to Grid/Flexbox (currently) so aFrame
    * should be a grid/flex item.
    */
-  static nscoord MinSizeContributionForAxis(mozilla::PhysicalAxis aAxis,
-                                            nsRenderingContext*   aRC,
-                                            nsIFrame*             aFrame,
-                                            IntrinsicISizeType    aType,
-                                            uint32_t              aFlags = 0);
-
-  /**
-   * This function increases an initial intrinsic size, 'aCurrent', according
-   * to the given 'aPercent', such that the size-increase makes up exactly
-   * 'aPercent' percent of the returned value.  If 'aPercent' or 'aCurrent' are
-   * less than or equal to zero the original 'aCurrent' value is returned.
-   * If 'aPercent' is greater than or equal to 1.0 the value nscoord_MAX is
-   * returned.
-   */
-  static nscoord AddPercents(nscoord aCurrent, float aPercent)
-  {
-    if (aPercent > 0.0f && aCurrent > 0) {
-      return MOZ_UNLIKELY(aPercent >= 1.0f) ? nscoord_MAX
-        : NSToCoordRound(float(aCurrent) / (1.0f - aPercent));
-    }
-    return aCurrent;
-  }
+  static nscoord
+  MinSizeContributionForAxis(mozilla::PhysicalAxis aAxis,
+                            nsRenderingContext*   aRC,
+                            nsIFrame*              aFrame,
+                            IntrinsicISizeType     aType,
+                            const LogicalSize&     aPercentageBasis,
+                            uint32_t               aFlags = 0);
 
   /*
    * Convert nsStyleCoord to nscoord when percentages depend on the
@@ -2876,6 +2865,62 @@ public:
   static nsRect ComputeGeometryBox(nsIFrame* aFrame,
                                    StyleGeometryBox aGeometryBox);
 
+  /**
+   * Resolve a CSS <length-percentage> value to a definite size.
+   */
+  template<bool clampNegativeResultToZero>
+  static nscoord ResolveToLength(const nsStyleCoord& aCoord,
+                                 nscoord aPercentageBasis)
+  {
+    NS_WARNING_ASSERTION(aPercentageBasis >= nscoord(0), "nscoord overflow?");
+
+    switch (aCoord.GetUnit()) {
+      case eStyleUnit_Coord:
+        MOZ_ASSERT(!clampNegativeResultToZero || aCoord.GetCoordValue() >= 0,
+                   "This value should have been rejected by the style system");
+        return aCoord.GetCoordValue();
+      case eStyleUnit_Percent:
+        if (aPercentageBasis == NS_UNCONSTRAINEDSIZE) {
+          return nscoord(0);
+        }
+        MOZ_ASSERT(!clampNegativeResultToZero || aCoord.GetPercentValue() >= 0,
+                   "This value should have been rejected by the style system");
+        return NSToCoordFloorClamped(aPercentageBasis *
+                                     aCoord.GetPercentValue());
+      case eStyleUnit_Calc: {
+        nsStyleCoord::Calc* calc = aCoord.GetCalcValue();
+        nscoord result;
+        if (aPercentageBasis == NS_UNCONSTRAINEDSIZE) {
+          result = calc->mLength;
+        } else {
+          result = calc->mLength +
+            NSToCoordFloorClamped(aPercentageBasis * calc->mPercent);
+        }
+        if (clampNegativeResultToZero && result < 0) {
+          return nscoord(0);
+        }
+        return result;
+      }
+      default:
+        MOZ_ASSERT_UNREACHABLE("Unexpected unit!");
+        return nscoord(0);
+    }
+  }
+
+  /**
+   * Resolve a column-gap/row-gap to a definite size.
+   * @note This method resolves 'normal' to zero.
+   *   Callers who want different behavior should handle 'normal' on their own.
+   */
+  static nscoord ResolveGapToLength(const nsStyleCoord& aGap,
+                                    nscoord aPercentageBasis)
+  {
+    if (aGap.GetUnit() == eStyleUnit_Normal) {
+      return nscoord(0);
+    }
+    return ResolveToLength<true>(aGap, aPercentageBasis);
+  }
+
 private:
   static uint32_t sFontSizeInflationEmPerLine;
   static uint32_t sFontSizeInflationMinTwips;
diff --git a/layout/generic/nsColumnSetFrame.cpp b/layout/generic/nsColumnSetFrame.cpp
index ad36ba1a8..6ea15d4d2 100644
--- a/layout/generic/nsColumnSetFrame.cpp
+++ b/layout/generic/nsColumnSetFrame.cpp
@@ -183,18 +183,15 @@ nsColumnSetFrame::GetAvailableContentBSize(const ReflowInput& aReflowInput)
 
 static nscoord
 GetColumnGap(nsColumnSetFrame*    aFrame,
-             const nsStyleColumn* aColStyle)
+             const nsStyleColumn* aColStyle,
+             nscoord              aPercentageBasis)
 {
-  if (eStyleUnit_Normal == aColStyle->mColumnGap.GetUnit())
+  const auto& columnGap = aColStyle->mColumnGap;
+  if (columnGap.GetUnit() == eStyleUnit_Normal) {
     return aFrame->StyleFont()->mFont.size;
-  if (eStyleUnit_Coord == aColStyle->mColumnGap.GetUnit()) {
-    nscoord colGap = aColStyle->mColumnGap.GetCoordValue();
-    NS_ASSERTION(colGap >= 0, "negative column gap");
-    return colGap;
   }
 
-  NS_NOTREACHED("Unknown gap type");
-  return 0;
+  return nsLayoutUtils::ResolveGapToLength(columnGap, aPercentageBasis);
 }
 
 nsColumnSetFrame::ReflowConfig
@@ -227,7 +224,7 @@ nsColumnSetFrame::ChooseColumnStrategy(const ReflowInput& aReflowInput,
     colBSize = std::min(colBSize, aReflowInput.ComputedMaxBSize());
   }
 
-  nscoord colGap = GetColumnGap(this, colStyle);
+  nscoord colGap = GetColumnGap(this, colStyle, aReflowInput.ComputedISize());
   int32_t numColumns = colStyle->mColumnCount;
 
   // If column-fill is set to 'balance', then we want to balance the columns.
@@ -403,7 +400,7 @@ nsColumnSetFrame::GetMinISize(nsRenderingContext *aRenderingContext)
     // include n-1 column gaps.
     colISize = iSize;
     iSize *= colStyle->mColumnCount;
-    nscoord colGap = GetColumnGap(this, colStyle);
+    nscoord colGap = GetColumnGap(this, colStyle, NS_UNCONSTRAINEDSIZE);
     iSize += colGap * (colStyle->mColumnCount - 1);
     // The multiplication above can make 'width' negative (integer overflow),
     // so use std::max to protect against that.
@@ -424,7 +421,7 @@ nsColumnSetFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
   nscoord result = 0;
   DISPLAY_PREF_WIDTH(this, result);
   const nsStyleColumn* colStyle = StyleColumn();
-  nscoord colGap = GetColumnGap(this, colStyle);
+  nscoord colGap = GetColumnGap(this, colStyle, NS_UNCONSTRAINEDSIZE);
 
   nscoord colISize;
   if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index bd96f213b..a531dea07 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -4515,68 +4515,44 @@ nsIFrame::InlinePrefISizeData::ForceBreak()
   mSkipWhitespace = true;
 }
 
-static void
-AddCoord(const nsStyleCoord& aStyle,
-         nsIFrame* aFrame,
-         nscoord* aCoord, float* aPercent,
-         bool aClampNegativeToZero)
-{
-  switch (aStyle.GetUnit()) {
-    case eStyleUnit_Coord: {
-      NS_ASSERTION(!aClampNegativeToZero || aStyle.GetCoordValue() >= 0,
-                   "unexpected negative value");
-      *aCoord += aStyle.GetCoordValue();
-      return;
-    }
-    case eStyleUnit_Percent: {
-      NS_ASSERTION(!aClampNegativeToZero || aStyle.GetPercentValue() >= 0.0f,
-                   "unexpected negative value");
-      *aPercent += aStyle.GetPercentValue();
-      return;
-    }
-    case eStyleUnit_Calc: {
-      const nsStyleCoord::Calc *calc = aStyle.GetCalcValue();
-      if (aClampNegativeToZero) {
-        // This is far from ideal when one is negative and one is positive.
-        *aCoord += std::max(calc->mLength, 0);
-        *aPercent += std::max(calc->mPercent, 0.0f);
-      } else {
-        *aCoord += calc->mLength;
-        *aPercent += calc->mPercent;
-      }
-      return;
-    }
-    default: {
-      return;
-    }
+static nscoord
+ResolveMargin(const nsStyleCoord& aStyle, nscoord aPercentageBasis)
+{
+  if (aStyle.GetUnit() == eStyleUnit_Auto) {
+    return nscoord(0);
   }
+  return nsLayoutUtils::ResolveToLength<false>(aStyle, aPercentageBasis);
+}
+
+static nscoord
+ResolvePadding(const nsStyleCoord& aStyle, nscoord aPercentageBasis)
+{
+  return nsLayoutUtils::ResolveToLength<true>(aStyle, aPercentageBasis);
 }
 
 static nsIFrame::IntrinsicISizeOffsetData
-IntrinsicSizeOffsets(nsIFrame* aFrame, bool aForISize)
+IntrinsicSizeOffsets(nsIFrame* aFrame, nscoord aPercentageBasis, bool aForISize)
 {
   nsIFrame::IntrinsicISizeOffsetData result;
   WritingMode wm = aFrame->GetWritingMode();
-  const nsStyleMargin* styleMargin = aFrame->StyleMargin();
+  const auto& margin = aFrame->StyleMargin()->mMargin;
   bool verticalAxis = aForISize == wm.IsVertical();
-  AddCoord(verticalAxis ? styleMargin->mMargin.GetTop()
-                        : styleMargin->mMargin.GetLeft(),
-           aFrame, &result.hMargin, &result.hPctMargin,
-           false);
-  AddCoord(verticalAxis ? styleMargin->mMargin.GetBottom()
-                        : styleMargin->mMargin.GetRight(),
-           aFrame, &result.hMargin, &result.hPctMargin,
-           false);
-
-  const nsStylePadding* stylePadding = aFrame->StylePadding();
-  AddCoord(verticalAxis ? stylePadding->mPadding.GetTop()
-                        : stylePadding->mPadding.GetLeft(),
-           aFrame, &result.hPadding, &result.hPctPadding,
-           true);
-  AddCoord(verticalAxis ? stylePadding->mPadding.GetBottom()
-                        : stylePadding->mPadding.GetRight(),
-           aFrame, &result.hPadding, &result.hPctPadding,
-           true);
+  if (verticalAxis) {
+    result.hMargin += ResolveMargin(margin.GetTop(), aPercentageBasis);
+    result.hMargin += ResolveMargin(margin.GetBottom(), aPercentageBasis);
+  } else {
+    result.hMargin += ResolveMargin(margin.GetLeft(), aPercentageBasis);
+    result.hMargin += ResolveMargin(margin.GetRight(), aPercentageBasis);
+  }
+
+  const auto& padding = aFrame->StylePadding()->mPadding;
+  if (verticalAxis) {
+    result.hPadding += ResolvePadding(padding.GetTop(), aPercentageBasis);
+    result.hPadding += ResolvePadding(padding.GetBottom(), aPercentageBasis);
+  } else {
+    result.hPadding += ResolvePadding(padding.GetLeft(), aPercentageBasis);
+    result.hPadding += ResolvePadding(padding.GetRight(), aPercentageBasis);
+  }
 
   const nsStyleBorder* styleBorder = aFrame->StyleBorder();
   if (verticalAxis) {
@@ -4606,22 +4582,21 @@ IntrinsicSizeOffsets(nsIFrame* aFrame, bool aForISize)
       result.hPadding =
         presContext->DevPixelsToAppUnits(verticalAxis ? padding.TopBottom()
                                                       : padding.LeftRight());
-      result.hPctPadding = 0;
     }
   }
   return result;
 }
 
 /* virtual */ nsIFrame::IntrinsicISizeOffsetData
-nsFrame::IntrinsicISizeOffsets()
+nsFrame::IntrinsicISizeOffsets(nscoord aPercentageBasis)
 {
-  return IntrinsicSizeOffsets(this, true);
+  return IntrinsicSizeOffsets(this, aPercentageBasis, true);
 }
 
 nsIFrame::IntrinsicISizeOffsetData
-nsIFrame::IntrinsicBSizeOffsets()
+nsIFrame::IntrinsicBSizeOffsets(nscoord aPercentageBasis)
 {
-  return IntrinsicSizeOffsets(this, false);
+  return IntrinsicSizeOffsets(this, aPercentageBasis, false);
 }
 
 /* virtual */ IntrinsicSize
diff --git a/layout/generic/nsFrame.h b/layout/generic/nsFrame.h
index af1c95ef2..439e39856 100644
--- a/layout/generic/nsFrame.h
+++ b/layout/generic/nsFrame.h
@@ -261,7 +261,8 @@ public:
                                  InlineMinISizeData *aData) override;
   virtual void AddInlinePrefISize(nsRenderingContext *aRenderingContext,
                                   InlinePrefISizeData *aData) override;
-  virtual IntrinsicISizeOffsetData IntrinsicISizeOffsets() override;
+  IntrinsicISizeOffsetData
+  IntrinsicISizeOffsets(nscoord aPercentageBasis = NS_UNCONSTRAINEDSIZE) override;
   virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
   virtual nsSize GetIntrinsicRatio() override;
 
diff --git a/layout/generic/nsGridContainerFrame.cpp b/layout/generic/nsGridContainerFrame.cpp
index 3a2d5ad1d..959061e33 100644
--- a/layout/generic/nsGridContainerFrame.cpp
+++ b/layout/generic/nsGridContainerFrame.cpp
@@ -8,8 +8,8 @@
 
 #include "nsGridContainerFrame.h"
 
-#include <algorithm> // for std::stable_sort
 #include <limits>
+#include <stdlib.h> // for div()
 #include "mozilla/CSSAlignUtils.h"
 #include "mozilla/dom/GridBinding.h"
 #include "mozilla/Function.h"
@@ -127,43 +127,6 @@ ResolveToDefiniteSize(const nsStyleCoord& aCoord, nscoord aPercentBasis)
                   nsRuleNode::ComputeCoordPercentCalc(aCoord, aPercentBasis));
 }
 
-static bool
-GetPercentSizeParts(const nsStyleCoord& aCoord, nscoord* aLength, float* aPercent)
-{
-  switch (aCoord.GetUnit()) {
-    case eStyleUnit_Percent:
-      *aLength = 0;
-      *aPercent = aCoord.GetPercentValue();
-      return true;
-    case eStyleUnit_Calc: {
-      nsStyleCoord::Calc* calc = aCoord.GetCalcValue();
-      *aLength = calc->mLength;
-      *aPercent = calc->mPercent;
-      return true;
-    }
-    default:
-      return false;
-  }
-}
-
-static void
-ResolvePercentSizeParts(const nsStyleCoord& aCoord, nscoord aPercentBasis,
-                        nscoord* aLength, float* aPercent)
-{
-  MOZ_ASSERT(aCoord.IsCoordPercentCalcUnit());
-  if (aPercentBasis != NS_UNCONSTRAINEDSIZE) {
-    *aLength = std::max(nscoord(0),
-                        nsRuleNode::ComputeCoordPercentCalc(aCoord,
-                                                            aPercentBasis));
-    *aPercent = 0.0f;
-    return;
-  }
-  if (!GetPercentSizeParts(aCoord, aLength, aPercent)) {
-    *aLength = aCoord.ToLength();
-    *aPercent = 0.0f;
-  }
-}
-
 // Synthesize a baseline from a border box.  For an alphabetical baseline
 // this is the end edge of the border box.  For a central baseline it's
 // the center of the border box.
@@ -198,7 +161,7 @@ struct nsGridContainerFrame::TrackSize
     eMaxContentMinSizing =        0x4,
     eMinOrMaxContentMinSizing = eMinContentMinSizing | eMaxContentMinSizing,
     eIntrinsicMinSizing = eMinOrMaxContentMinSizing | eAutoMinSizing,
-    // 0x8 is unused, feel free to take it!
+    eModified =                   0x8,
     eAutoMaxSizing =             0x10,
     eMinContentMaxSizing =       0x20,
     eMaxContentMaxSizing =       0x40,
@@ -211,6 +174,7 @@ struct nsGridContainerFrame::TrackSize
     eSkipGrowUnlimited = eSkipGrowUnlimited1 | eSkipGrowUnlimited2,
     eBreakBefore =              0x800,
     eFitContent =              0x1000,
+    eInfinitelyGrowable =      0x2000,
   };
 
   StateBits Initialize(nscoord aPercentageBasis,
@@ -724,9 +688,6 @@ struct nsGridContainerFrame::LineRange
                  mEnd > mStart, "invalid line range");
       mEnd -= aNumRemovedTracks[mEnd];
     }
-    if (mStart == mEnd) {
-      mEnd = nsGridContainerFrame::kAutoLine;
-    }
   }
   /**
    * Return the contribution of this line range for step 2 in
@@ -856,6 +817,8 @@ struct nsGridContainerFrame::GridItemInfo
 
   // Return true if we should apply Automatic Minimum Size to this item.
   // https://drafts.csswg.org/css-grid/#min-size-auto
+  // @note the caller should also check that the item spans at least one track
+  // that has a min track sizing function that is 'auto' before applying it.
   bool ShouldApplyAutoMinSize(WritingMode aContainerWM,
                               LogicalAxis aContainerAxis,
                               nscoord aPercentageBasis) const
@@ -915,6 +878,12 @@ nsGridContainerFrame::GridItemInfo::Dump() const
     if (state & ItemState::eIsFlexing) {
       printf("flexing ");
     }
+    if (state & ItemState::eApplyAutoMinSize) {
+      printf("auto-min-size ");
+    }
+    if (state & ItemState::eClampMarginBoxMinSize) {
+      printf("clamp ");
+    }
     if (state & ItemState::eFirstBaseline) {
       printf("first baseline %s-alignment ",
              (state & ItemState::eSelfBaseline) ? "self" : "content");
@@ -1091,6 +1060,7 @@ private:
   const nsTArray<nsString>& mRepeatAutoLineNameListBefore;
   const nsTArray<nsString>& mRepeatAutoLineNameListAfter;
   // The index of the repeat(auto-fill/fit) track, or zero if there is none.
+  // Relative to mExplicitGridOffset (repeat tracks are explicit by definition).
   const uint32_t mRepeatAutoStart;
   // The (hypothetical) index of the last such repeat() track.
   const uint32_t mRepeatAutoEnd;
@@ -1101,6 +1071,7 @@ private:
   // generates one track (making mRepeatEndDelta == 0).
   const uint32_t mTemplateLinesEnd;
   // True if there is a specified repeat(auto-fill/fit) track.
+  // Indexed relative to mExplicitGridOffset + mRepeatAutoStart.
   const bool mHasRepeatAuto;
 };
 
@@ -1164,7 +1135,7 @@ struct nsGridContainerFrame::TrackSizingFunctions
       return 1;
     }
     nscoord repeatTrackSize = 0;
-    // Note that the repeat() track size is included in |sum| in this loop.
+    // Note that one repeat() track size is included in |sum| in this loop.
     nscoord sum = 0;
     const nscoord percentBasis = aSize;
     for (uint32_t i = 0; i < numTracks; ++i) {
@@ -1181,54 +1152,31 @@ struct nsGridContainerFrame::TrackSizingFunctions
       }
       nscoord trackSize = ::ResolveToDefiniteSize(*coord, percentBasis);
       if (i == mRepeatAutoStart) {
-        if (percentBasis != NS_UNCONSTRAINEDSIZE) {
-          // Use a minimum 1px for the repeat() track-size.
-          if (trackSize < AppUnitsPerCSSPixel()) {
-            trackSize = AppUnitsPerCSSPixel();
-          }
+        // Use a minimum 1px for the repeat() track-size.
+        if (trackSize < AppUnitsPerCSSPixel()) {
+          trackSize = AppUnitsPerCSSPixel();
         }
         repeatTrackSize = trackSize;
       }
       sum += trackSize;
     }
-    nscoord gridGap;
-    float percentSum = 0.0f;
-    float gridGapPercent;
-    ResolvePercentSizeParts(aGridGap, percentBasis, &gridGap, &gridGapPercent);
+    nscoord gridGap = nsLayoutUtils::ResolveGapToLength(aGridGap, aSize);
     if (numTracks > 1) {
       // Add grid-gaps for all the tracks including the repeat() track.
       sum += gridGap * (numTracks - 1);
-      percentSum = gridGapPercent * (numTracks - 1);
     }
     // Calculate the max number of tracks that fits without overflow.
     nscoord available = maxFill != NS_UNCONSTRAINEDSIZE ? maxFill : aMinSize;
-    nscoord size = nsLayoutUtils::AddPercents(sum, percentSum);
-    if (available - size < 0) {
+    nscoord spaceToFill = available - sum;
+    if (spaceToFill <= 0) {
       // "if any number of repetitions would overflow, then 1 repetition"
       return 1;
     }
-    uint32_t numRepeatTracks = 1;
-    bool exactFit = false;
-    while (true) {
-      sum += gridGap + repeatTrackSize;
-      percentSum += gridGapPercent;
-      nscoord newSize = nsLayoutUtils::AddPercents(sum, percentSum);
-      if (newSize <= size) {
-        // Adding more repeat-tracks won't make forward progress.
-        return numRepeatTracks;
-      }
-      size = newSize;
-      nscoord remaining = available - size;
-      exactFit = remaining == 0;
-      if (remaining >= 0) {
-        ++numRepeatTracks;
-      }
-      if (remaining <= 0) {
-        break;
-      }
-    }
-
-    if (!exactFit && maxFill == NS_UNCONSTRAINEDSIZE) {
+    // Calculate the max number of tracks that fits without overflow.
+    div_t q = div(spaceToFill, repeatTrackSize + gridGap);
+    // The +1 here is for the one repeat track we already accounted for above.
+    uint32_t numRepeatTracks = q.quot + 1;
+    if (q.rem != 0 && maxFill == NS_UNCONSTRAINEDSIZE) {
       // "Otherwise, if the grid container has a definite min size in
       // the relevant axis, the number of repetitions is the largest possible
       // positive integer that fulfills that minimum requirement."
@@ -1340,15 +1288,9 @@ struct nsGridContainerFrame::Tracks
                   nscoord                     aContentBoxSize);
 
   /**
-   * Return true if aRange spans at least one track with an intrinsic sizing
-   * function and does not span any tracks with a <flex> max-sizing function.
-   * @param aRange the span of tracks to check
-   * @param aState will be set to the union of the state bits of all the spanned
-   *               tracks, unless a flex track is found - then it only contains
-   *               the union of the tracks up to and including the flex track.
+   * Return the union of the state bits for the tracks in aRange.
    */
-  bool HasIntrinsicButNoFlexSizingInRange(const LineRange&      aRange,
-                                          TrackSize::StateBits* aState) const;
+   TrackSize::StateBits StateBitsForRange(const LineRange& aRange) const;
 
   // Some data we collect for aligning baseline-aligned items.
   struct ItemBaselineData
@@ -1383,6 +1325,62 @@ struct nsGridContainerFrame::Tracks
    */
   void AlignBaselineSubtree(const GridItemInfo& aGridItem) const;
 
+  enum class TrackSizingPhase
+  {
+    eIntrinsicMinimums,
+    eContentBasedMinimums,
+    eMaxContentMinimums,
+    eIntrinsicMaximums,
+    eMaxContentMaximums,
+  };
+
+  // Some data we collect on each item for Step 2 of the Track Sizing Algorithm
+  // in ResolveIntrinsicSize below.
+  struct Step2ItemData final
+  {
+    uint32_t mSpan;
+    TrackSize::StateBits mState;
+    LineRange mLineRange;
+    nscoord mMinSize;
+    nscoord mMinContentContribution;
+    nscoord mMaxContentContribution;
+    nsIFrame* mFrame;
+    static bool IsSpanLessThan(const Step2ItemData& a, const Step2ItemData& b)
+    {
+      return a.mSpan < b.mSpan;
+    }
+
+    template<TrackSizingPhase phase>
+    nscoord SizeContributionForPhase() const
+    {
+      switch (phase) {
+        case TrackSizingPhase::eIntrinsicMinimums:
+        case TrackSizingPhase::eIntrinsicMaximums:
+          return mMinSize;
+        case TrackSizingPhase::eContentBasedMinimums:
+          return mMinContentContribution;
+        case TrackSizingPhase::eMaxContentMinimums:
+        case TrackSizingPhase::eMaxContentMaximums:
+          return mMaxContentContribution;
+      }
+      MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected phase");
+    }
+  };
+
+  using FitContentClamper =
+    function<bool(uint32_t aTrack, nscoord aMinSize, nscoord* aSize)>;
+
+  // Helper method for ResolveIntrinsicSize.
+  template<TrackSizingPhase phase>
+  bool GrowSizeForSpanningItems(nsTArray<Step2ItemData>::iterator aIter,
+                                const nsTArray<Step2ItemData>::iterator aEnd,
+                                nsTArray<uint32_t>& aTracks,
+                                nsTArray<TrackSize>& aPlan,
+                                nsTArray<TrackSize>& aItemPlan,
+                                TrackSize::StateBits aSelector,
+                                const FitContentClamper& aClamper = nullptr,
+                                bool aNeedInfinitelyGrowableFlag = false);
+
   /**
    * Resolve Intrinsic Track Sizes.
    * http://dev.w3.org/csswg/css-grid/#algo-content
@@ -1405,66 +1403,117 @@ struct nsGridContainerFrame::Tracks
                                  SizingConstraint            aConstraint,
                                  const LineRange&            aRange,
                                  const GridItemInfo&         aGridItem);
+
+  // Helper method that returns the track size to use in §11.5.1.2
+  // https://drafts.csswg.org/css-grid/#extra-space
+  template<TrackSizingPhase phase> static
+  nscoord StartSizeInDistribution(const TrackSize& aSize)
+  {
+    switch (phase) {
+      case TrackSizingPhase::eIntrinsicMinimums:
+      case TrackSizingPhase::eContentBasedMinimums:
+      case TrackSizingPhase::eMaxContentMinimums:
+        return aSize.mBase;
+      case TrackSizingPhase::eIntrinsicMaximums:
+      case TrackSizingPhase::eMaxContentMaximums:
+        if (aSize.mLimit == NS_UNCONSTRAINEDSIZE) {
+          return aSize.mBase;
+        }
+        return aSize.mLimit;
+    }
+    MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected phase");
+  }
+
   /**
    * Collect the tracks which are growable (matching aSelector) into
    * aGrowableTracks, and return the amount of space that can be used
-   * to grow those tracks.  Specifically, we return aAvailableSpace minus
-   * the sum of mBase's (and corresponding grid gaps) in aPlan (clamped to 0)
-   * for the tracks in aRange, or zero when there are no growable tracks.
-   * @note aPlan[*].mBase represents a planned new base or limit.
+   * to grow those tracks.  This method implements CSS Grid §11.5.1.2.
+   * https://drafts.csswg.org/css-grid/#extra-space
    */
-  nscoord CollectGrowable(nscoord                    aAvailableSpace,
-                          const nsTArray<TrackSize>& aPlan,
-                          const LineRange&           aRange,
-                          TrackSize::StateBits       aSelector,
-                          nsTArray<uint32_t>&        aGrowableTracks) const
+  template<TrackSizingPhase phase>
+  nscoord CollectGrowable(nscoord              aAvailableSpace,
+                          const LineRange&     aRange,
+                          TrackSize::StateBits aSelector,
+                          nsTArray<uint32_t>&  aGrowableTracks) const
   {
     MOZ_ASSERT(aAvailableSpace > 0, "why call me?");
     nscoord space = aAvailableSpace - mGridGap * (aRange.Extent() - 1);
     const uint32_t start = aRange.mStart;
     const uint32_t end = aRange.mEnd;
     for (uint32_t i = start; i < end; ++i) {
-      const TrackSize& sz = aPlan[i];
-      space -= sz.mBase;
+      const TrackSize& sz = mSizes[i];
+      space -= StartSizeInDistribution<phase>(sz);
       if (space <= 0) {
         return 0;
       }
-      if ((sz.mState & aSelector) && !sz.IsFrozen()) {
+      if (sz.mState & aSelector) {
         aGrowableTracks.AppendElement(i);
       }
     }
     return aGrowableTracks.IsEmpty() ? 0 : space;
   }
 
-  void SetupGrowthPlan(nsTArray<TrackSize>&      aPlan,
-                       const nsTArray<uint32_t>& aTracks) const
+  template<TrackSizingPhase phase>
+  void InitializeItemPlan(nsTArray<TrackSize>&      aItemPlan,
+                          const nsTArray<uint32_t>& aTracks) const
   {
     for (uint32_t track : aTracks) {
-      aPlan[track] = mSizes[track];
+      auto& plan = aItemPlan[track];
+      const TrackSize& sz = mSizes[track];
+      plan.mBase = StartSizeInDistribution<phase>(sz);
+      bool unlimited = sz.mState & TrackSize::eInfinitelyGrowable;
+      plan.mLimit = unlimited ? NS_UNCONSTRAINEDSIZE : sz.mLimit;
+      plan.mState = sz.mState;
     }
   }
 
-  void CopyPlanToBase(const nsTArray<TrackSize>& aPlan,
-                      const nsTArray<uint32_t>&  aTracks)
+  template<TrackSizingPhase phase>
+  void InitializePlan(nsTArray<TrackSize>& aPlan) const
   {
-    for (uint32_t track : aTracks) {
-      MOZ_ASSERT(mSizes[track].mBase <= aPlan[track].mBase);
-      mSizes[track].mBase = aPlan[track].mBase;
+    for (size_t i = 0, len = aPlan.Length(); i < len; ++i) {
+      auto& plan = aPlan[i];
+      const auto& sz = mSizes[i];
+      plan.mBase = StartSizeInDistribution<phase>(sz);
+      MOZ_ASSERT(phase == TrackSizingPhase::eMaxContentMaximums ||
+                 !(sz.mState & TrackSize::eInfinitelyGrowable),
+                 "forgot to reset the eInfinitelyGrowable bit?");
+      plan.mState = sz.mState;
     }
   }
 
-  void CopyPlanToLimit(const nsTArray<TrackSize>& aPlan,
-                       const nsTArray<uint32_t>&  aTracks)
+  template<TrackSizingPhase phase>
+  void CopyPlanToSize(const nsTArray<TrackSize>& aPlan,
+                      bool aNeedInfinitelyGrowableFlag = false)
   {
-    for (uint32_t track : aTracks) {
-      MOZ_ASSERT(mSizes[track].mLimit == NS_UNCONSTRAINEDSIZE ||
-                 mSizes[track].mLimit <= aPlan[track].mBase);
-      mSizes[track].mLimit = aPlan[track].mBase;
+    for (size_t i = 0, len = mSizes.Length(); i < len; ++i) {
+      const auto& plan = aPlan[i];
+      MOZ_ASSERT(plan.mBase >= 0);
+      auto& sz = mSizes[i];
+      switch (phase) {
+        case TrackSizingPhase::eIntrinsicMinimums:
+        case TrackSizingPhase::eContentBasedMinimums:
+        case TrackSizingPhase::eMaxContentMinimums:
+          sz.mBase = plan.mBase;
+          break;
+        case TrackSizingPhase::eIntrinsicMaximums:
+          if (plan.mState & TrackSize::eModified) {
+            if (sz.mLimit == NS_UNCONSTRAINEDSIZE &&
+                aNeedInfinitelyGrowableFlag) {
+              sz.mState |= TrackSize::eInfinitelyGrowable;
+            }
+            sz.mLimit = plan.mBase;
+          }
+          break;
+        case TrackSizingPhase::eMaxContentMaximums:
+          if (plan.mState & TrackSize::eModified) {
+            sz.mLimit = plan.mBase;
+          }
+          sz.mState &= ~TrackSize::eInfinitelyGrowable;
+          break;
+      }
     }
   }
 
-  using FitContentClamper =
-    function<bool(uint32_t aTrack, nscoord aMinSize, nscoord* aSize)>;
   /**
    * Grow the planned size for tracks in aGrowableTracks up to their limit
    * and then freeze them (all aGrowableTracks must be unfrozen on entry).
@@ -1524,12 +1573,13 @@ struct nsGridContainerFrame::Tracks
    * assumed that aPlan have no aSkipFlag set for tracks in aGrowableTracks
    * on entry to this method.
    */
-   uint32_t MarkExcludedTracks(nsTArray<TrackSize>&      aPlan,
-                               uint32_t                  aNumGrowable,
-                               const nsTArray<uint32_t>& aGrowableTracks,
-                               TrackSize::StateBits      aMinSizingSelector,
-                               TrackSize::StateBits      aMaxSizingSelector,
-                               TrackSize::StateBits      aSkipFlag) const
+   static uint32_t
+   MarkExcludedTracks(nsTArray<TrackSize>&      aPlan,
+                      uint32_t                  aNumGrowable,
+                      const nsTArray<uint32_t>& aGrowableTracks,
+                      TrackSize::StateBits      aMinSizingSelector,
+                      TrackSize::StateBits      aMaxSizingSelector,
+                      TrackSize::StateBits      aSkipFlag)
   {
     bool foundOneSelected = false;
     bool foundOneGrowable = false;
@@ -1559,41 +1609,60 @@ struct nsGridContainerFrame::Tracks
   }
 
   /**
-   * Increase the planned size for tracks in aGrowableTracks that match
-   * aSelector (or all tracks if aSelector is zero) beyond their limit.
+   * Mark all tracks in aGrowableTracks with an eSkipGrowUnlimited bit if
+   * they *shouldn't* grow unlimited in §11.5.1.2.3 "Distribute space beyond
+   * growth limits" https://drafts.csswg.org/css-grid/#extra-space
+   * Return the number of tracks that are still growable.
+   */
+  template<TrackSizingPhase phase>
+  static uint32_t
+  MarkExcludedTracks(nsTArray<TrackSize>&      aPlan,
+                     const nsTArray<uint32_t>& aGrowableTracks,
+                     TrackSize::StateBits      aSelector)
+  {
+    uint32_t numGrowable = aGrowableTracks.Length();
+    if (phase == TrackSizingPhase::eIntrinsicMaximums ||
+        phase == TrackSizingPhase::eMaxContentMaximums) {
+      // "when handling any intrinsic growth limit: all affected tracks"
+      return numGrowable;
+    }
+    MOZ_ASSERT(aSelector == (aSelector & TrackSize::eIntrinsicMinSizing) &&
+                            (aSelector & TrackSize::eMaxContentMinSizing),
+               "Should only get here for track sizing steps 2.1 to 2.3");
+    // Note that eMaxContentMinSizing is always included. We do those first:
+    numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
+                                     TrackSize::eMaxContentMinSizing,
+                                     TrackSize::eMaxContentMaxSizing,
+                                     TrackSize::eSkipGrowUnlimited1);
+    // Now mark min-content/auto min-sizing tracks if requested.
+    auto minOrAutoSelector = aSelector & ~TrackSize::eMaxContentMinSizing;
+    if (minOrAutoSelector) {
+      numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
+                                       minOrAutoSelector,
+                                       TrackSize::eIntrinsicMaxSizing,
+                                       TrackSize::eSkipGrowUnlimited2);
+    }
+    return numGrowable;
+  }
+
+  /**
+   * Increase the planned size for tracks in aGrowableTracks that aren't
+   * marked with a eSkipGrowUnlimited flag beyond their limit.
    * This implements the "Distribute space beyond growth limits" step in
    * https://drafts.csswg.org/css-grid/#distribute-extra-space
    */
   void GrowSelectedTracksUnlimited(nscoord                   aAvailableSpace,
                                    nsTArray<TrackSize>&      aPlan,
                                    const nsTArray<uint32_t>& aGrowableTracks,
-                                   TrackSize::StateBits      aSelector,
+                                   uint32_t                  aNumGrowable,
                                    FitContentClamper aFitContentClamper) const
   {
-    MOZ_ASSERT(aAvailableSpace > 0 && aGrowableTracks.Length() > 0);
-    uint32_t numGrowable = aGrowableTracks.Length();
-    if (aSelector) {
-      MOZ_ASSERT(aSelector == (aSelector & TrackSize::eIntrinsicMinSizing) &&
-                 (aSelector & TrackSize::eMaxContentMinSizing),
-                 "Should only get here for track sizing steps 2.1 to 2.3");
-      // Note that eMaxContentMinSizing is always included. We do those first:
-      numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
-                                       TrackSize::eMaxContentMinSizing,
-                                       TrackSize::eMaxContentMaxSizing,
-                                       TrackSize::eSkipGrowUnlimited1);
-      // Now mark min-content/auto min-sizing tracks if requested.
-      auto minOrAutoSelector = aSelector & ~TrackSize::eMaxContentMinSizing;
-      if (minOrAutoSelector) {
-        numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
-                                         minOrAutoSelector,
-                                         TrackSize::eIntrinsicMaxSizing,
-                                         TrackSize::eSkipGrowUnlimited2);
-      }
-    }
+    MOZ_ASSERT(aAvailableSpace > 0 && aGrowableTracks.Length() > 0 &&
+               aNumGrowable <= aGrowableTracks.Length());
     nscoord space = aAvailableSpace;
     DebugOnly<bool> didClamp = false;
-    while (numGrowable) {
-      nscoord spacePerTrack = std::max<nscoord>(space / numGrowable, 1);
+    while (aNumGrowable) {
+      nscoord spacePerTrack = std::max<nscoord>(space / aNumGrowable, 1);
       for (uint32_t track : aGrowableTracks) {
         TrackSize& sz = aPlan[track];
         if (sz.mState & TrackSize::eSkipGrowUnlimited) {
@@ -1609,7 +1678,7 @@ struct nsGridContainerFrame::Tracks
             delta = newBase - sz.mBase;
             MOZ_ASSERT(delta >= 0, "track size shouldn't shrink");
             sz.mState |= TrackSize::eSkipGrowUnlimited1;
-            --numGrowable;
+            --aNumGrowable;
           }
         }
         sz.mBase = newBase;
@@ -1628,46 +1697,30 @@ struct nsGridContainerFrame::Tracks
    * Distribute aAvailableSpace to the planned base size for aGrowableTracks
    * up to their limits, then distribute the remaining space beyond the limits.
    */
-  void DistributeToTrackBases(nscoord              aAvailableSpace,
+  template<TrackSizingPhase phase>
+  void DistributeToTrackSizes(nscoord              aAvailableSpace,
                               nsTArray<TrackSize>& aPlan,
+                              nsTArray<TrackSize>& aItemPlan,
                               nsTArray<uint32_t>&  aGrowableTracks,
-                              TrackSize::StateBits aSelector)
+                              TrackSize::StateBits aSelector,
+                              const FitContentClamper& aFitContentClamper)
   {
-    SetupGrowthPlan(aPlan, aGrowableTracks);
-    nscoord space = GrowTracksToLimit(aAvailableSpace, aPlan, aGrowableTracks, nullptr);
+    InitializeItemPlan<phase>(aItemPlan, aGrowableTracks);
+    nscoord space = GrowTracksToLimit(aAvailableSpace, aItemPlan, aGrowableTracks,
+                                      aFitContentClamper);
     if (space > 0) {
-      GrowSelectedTracksUnlimited(space, aPlan, aGrowableTracks, aSelector, nullptr);
+      uint32_t numGrowable =
+        MarkExcludedTracks<phase>(aItemPlan, aGrowableTracks, aSelector);
+      GrowSelectedTracksUnlimited(space, aItemPlan, aGrowableTracks,
+                                  numGrowable, aFitContentClamper);
     }
-    CopyPlanToBase(aPlan, aGrowableTracks);
-  }
-
-  /**
-   * Distribute aAvailableSpace to the planned limits for aGrowableTracks.
-   */
-  void DistributeToTrackLimits(nscoord              aAvailableSpace,
-                               nsTArray<TrackSize>& aPlan,
-                               nsTArray<uint32_t>&  aGrowableTracks,
-                               const TrackSizingFunctions& aFunctions,
-                               nscoord                     aPercentageBasis)
-  {
-    auto fitContentClamper = [&aFunctions, aPercentageBasis] (uint32_t aTrack,
-                                                              nscoord aMinSize,
-                                                              nscoord* aSize) {
-      nscoord fitContentLimit =
-        ::ResolveToDefiniteSize(aFunctions.MaxSizingFor(aTrack), aPercentageBasis);
-      if (*aSize > fitContentLimit) {
-        *aSize = std::max(aMinSize, fitContentLimit);
-        return true;
+    for (uint32_t track : aGrowableTracks) {
+      nscoord& plannedSize = aPlan[track].mBase;
+      nscoord itemIncurredSize = aItemPlan[track].mBase;
+      if (plannedSize < itemIncurredSize) {
+        plannedSize = itemIncurredSize;
       }
-      return false;
-    };
-    nscoord space = GrowTracksToLimit(aAvailableSpace, aPlan, aGrowableTracks,
-                                      fitContentClamper);
-    if (space > 0) {
-      GrowSelectedTracksUnlimited(aAvailableSpace, aPlan, aGrowableTracks,
-                                  TrackSize::StateBits(0), fitContentClamper);
     }
-    CopyPlanToLimit(aPlan, aGrowableTracks);
   }
 
   /**
@@ -1769,13 +1822,6 @@ struct nsGridContainerFrame::Tracks
                            WritingMode            aWM,
                            const LogicalSize&     aContainerSize);
 
-  /**
-   * Return the intrinsic size by back-computing percentages as:
-   * IntrinsicSize = SumOfCoordSizes / (1 - SumOfPercentages).
-   */
-  nscoord BackComputedIntrinsicSize(const TrackSizingFunctions& aFunctions,
-                                    const nsStyleCoord& aGridGap) const;
-
   nscoord GridLineEdge(uint32_t aLine, GridLineSide aSide) const
   {
     if (MOZ_UNLIKELY(mSizes.IsEmpty())) {
@@ -2085,11 +2131,10 @@ struct MOZ_STACK_CLASS nsGridContainerFrame::GridReflowInput
   }
 
   /**
-   * Calculate our track sizes.  If the given aContentBox block-axis size is
-   * unconstrained, it is assigned to the resulting intrinsic block-axis size.
+   * Calculate our track sizes.
    */
   void CalculateTrackSizes(const Grid&        aGrid,
-                           LogicalSize&       aContentBox,
+                           const LogicalSize& aContentBox,
                            SizingConstraint   aConstraint);
 
   /**
@@ -2575,7 +2620,7 @@ struct MOZ_STACK_CLASS nsGridContainerFrame::Grid
 void
 nsGridContainerFrame::GridReflowInput::CalculateTrackSizes(
   const Grid&        aGrid,
-  LogicalSize&       aContentBox,
+  const LogicalSize& aContentBox,
   SizingConstraint   aConstraint)
 {
   mCols.Initialize(mColFunctions, mGridStyle->mGridColumnGap,
@@ -2593,12 +2638,6 @@ nsGridContainerFrame::GridReflowInput::CalculateTrackSizes(
   mRows.CalculateSizes(*this, mGridItems, mRowFunctions,
                        aContentBox.BSize(mWM), &GridArea::mRows,
                        aConstraint);
-  if (aContentBox.BSize(mWM) == NS_AUTOHEIGHT) {
-    aContentBox.BSize(mWM) =
-      mRows.BackComputedIntrinsicSize(mRowFunctions, mGridStyle->mGridRowGap);
-    mRows.mGridGap =
-      ::ResolveToDefiniteSize(mGridStyle->mGridRowGap, aContentBox.BSize(mWM));
-  }
 }
 
 /**
@@ -3545,19 +3584,27 @@ nsGridContainerFrame::Grid::PlaceGridItems(GridReflowInput& aState,
   // Count empty 'auto-fit' tracks in the repeat() range.
   // |colAdjust| will have a count for each line in the grid of how many
   // tracks were empty between the start of the grid and that line.
+
+  // Since this loop is concerned with just the repeat tracks, we
+  // iterate from 0..NumRepeatTracks() which is the natural range of
+  // mRemoveRepeatTracks. This means we have to add
+  // (mExplicitGridOffset + mRepeatAutoStart) to get a zero-based
+  // index for arrays like mCellMap and colAdjust. We'll then fill out
+  // the colAdjust array for all the remaining lines.
   Maybe<nsTArray<uint32_t>> colAdjust;
   uint32_t numEmptyCols = 0;
   if (aState.mColFunctions.mHasRepeatAuto &&
       !gridStyle->mGridTemplateColumns.mIsAutoFill &&
       aState.mColFunctions.NumRepeatTracks() > 0) {
-    for (uint32_t col = aState.mColFunctions.mRepeatAutoStart,
-           endRepeat = aState.mColFunctions.mRepeatAutoEnd,
-           numColLines = mGridColEnd + 1;
-         col < numColLines; ++col) {
+    const uint32_t repeatStart = (aState.mColFunctions.mExplicitGridOffset +
+                                  aState.mColFunctions.mRepeatAutoStart);
+    const uint32_t numRepeats = aState.mColFunctions.NumRepeatTracks();
+    const uint32_t numColLines = mGridColEnd + 1;
+    for (uint32_t i = 0; i < numRepeats; ++i) {
       if (numEmptyCols) {
-        (*colAdjust)[col] = numEmptyCols;
+        (*colAdjust)[repeatStart + i] = numEmptyCols;
       }
-      if (col < endRepeat && mCellMap.IsEmptyCol(col)) {
+      if (mCellMap.IsEmptyCol(repeatStart + i)) {
         ++numEmptyCols;
         if (colAdjust.isNothing()) {
           colAdjust.emplace(numColLines);
@@ -3565,26 +3612,34 @@ nsGridContainerFrame::Grid::PlaceGridItems(GridReflowInput& aState,
           PodZero(colAdjust->Elements(), colAdjust->Length());
         }
 
-        uint32_t repeatIndex = col - aState.mColFunctions.mRepeatAutoStart;
-        MOZ_ASSERT(aState.mColFunctions.mRemovedRepeatTracks.Length() >
-                   repeatIndex);
-        aState.mColFunctions.mRemovedRepeatTracks[repeatIndex] = true;
+        aState.mColFunctions.mRemovedRepeatTracks[i] = true;
+      }
+    }
+    // Fill out the colAdjust array for all the columns after the
+    // repeats.
+    if (numEmptyCols) {
+      for (uint32_t col = repeatStart + numRepeats;
+          col < numColLines; ++col) {
+        (*colAdjust)[col] = numEmptyCols;
       }
     }
   }
+
+  // Do similar work for the row tracks, with the same logic.
   Maybe<nsTArray<uint32_t>> rowAdjust;
   uint32_t numEmptyRows = 0;
   if (aState.mRowFunctions.mHasRepeatAuto &&
       !gridStyle->mGridTemplateRows.mIsAutoFill &&
       aState.mRowFunctions.NumRepeatTracks() > 0) {
-    for (uint32_t row = aState.mRowFunctions.mRepeatAutoStart,
-           endRepeat = aState.mRowFunctions.mRepeatAutoEnd,
-           numRowLines = mGridRowEnd + 1;
-         row < numRowLines; ++row) {
+    const uint32_t repeatStart = (aState.mRowFunctions.mExplicitGridOffset +
+                                  aState.mRowFunctions.mRepeatAutoStart);
+    const uint32_t numRepeats = aState.mRowFunctions.NumRepeatTracks();
+    const uint32_t numRowLines = mGridRowEnd + 1;
+    for (uint32_t i = 0; i < numRepeats; ++i) {
       if (numEmptyRows) {
-        (*rowAdjust)[row] = numEmptyRows;
+        (*rowAdjust)[repeatStart + i] = numEmptyRows;
       }
-      if (row < endRepeat && mCellMap.IsEmptyRow(row)) {
+      if (mCellMap.IsEmptyRow(repeatStart + i)) {
         ++numEmptyRows;
         if (rowAdjust.isNothing()) {
           rowAdjust.emplace(numRowLines);
@@ -3592,10 +3647,13 @@ nsGridContainerFrame::Grid::PlaceGridItems(GridReflowInput& aState,
           PodZero(rowAdjust->Elements(), rowAdjust->Length());
         }
 
-        uint32_t repeatIndex = row - aState.mRowFunctions.mRepeatAutoStart;
-        MOZ_ASSERT(aState.mRowFunctions.mRemovedRepeatTracks.Length() >
-                   repeatIndex);
-        aState.mRowFunctions.mRemovedRepeatTracks[repeatIndex] = true;
+        aState.mRowFunctions.mRemovedRepeatTracks[i] = true;
+      }
+    }
+    if (numEmptyRows) {
+      for (uint32_t row = repeatStart + numRepeats;
+          row < numRowLines; ++row) {
+        (*rowAdjust)[row] = numEmptyRows;
       }
     }
   }
@@ -3681,7 +3739,7 @@ nsGridContainerFrame::Tracks::Initialize(
                                         aFunctions.MinSizingFor(i),
                                         aFunctions.MaxSizingFor(i));
   }
-  mGridGap = ::ResolveToDefiniteSize(aGridGap, aContentBoxSize);
+  mGridGap = nsLayoutUtils::ResolveGapToLength(aGridGap, aContentBoxSize);
   mContentBoxSize = aContentBoxSize;
 }
 
@@ -3762,8 +3820,7 @@ ContentContribution(const GridItemInfo&       aGridItem,
   PhysicalAxis axis(aCBWM.PhysicalAxis(aAxis));
   nscoord size = nsLayoutUtils::IntrinsicForAxis(axis, aRC, child, aConstraint,
                    aPercentageBasis,
-                   aFlags | nsLayoutUtils::BAIL_IF_REFLOW_NEEDED |
-                            nsLayoutUtils::ADD_PERCENTS,
+                   aFlags | nsLayoutUtils::BAIL_IF_REFLOW_NEEDED,
                    aMinSizeClamp);
   if (size == NS_INTRINSIC_WIDTH_UNKNOWN) {
     // We need to reflow the child to find its BSize contribution.
@@ -3800,15 +3857,7 @@ ContentContribution(const GridItemInfo&       aGridItem,
     LogicalSize availableSize(childWM, availISize, availBSize);
     size = ::MeasuringReflow(child, aState.mReflowInput, aRC, availableSize,
                              cbSize, iMinSizeClamp, bMinSizeClamp);
-    nsIFrame::IntrinsicISizeOffsetData offsets = child->IntrinsicBSizeOffsets();
-    size += offsets.hMargin;
-    auto percent = offsets.hPctMargin;
-    if (availBSize == NS_UNCONSTRAINEDSIZE) {
-      // We always want to add in percent padding too, unless we already did so
-      // using a resolved column size above.
-      percent += offsets.hPctPadding;
-    }
-    size = nsLayoutUtils::AddPercents(size, percent);
+    size += child->GetLogicalUsedMargin(childWM).BStartEnd(childWM);
     nscoord overflow = size - aMinSizeClamp;
     if (MOZ_UNLIKELY(overflow > 0)) {
       nscoord contentSize = child->ContentBSize(childWM);
@@ -3913,6 +3962,10 @@ MinSize(const GridItemInfo&    aGridItem,
     return s;
   }
 
+  if (aCache->mPercentageBasis.isNothing()) {
+    aCache->mPercentageBasis.emplace(aState.PercentageBasisFor(aAxis, aGridItem));
+  }
+
   // https://drafts.csswg.org/css-grid/#min-size-auto
   // This calculates the min-content contribution from either a definite
   // min-width (or min-height depending on aAxis), or the "specified /
@@ -3926,7 +3979,8 @@ MinSize(const GridItemInfo&    aGridItem,
              "baseline offset should be zero when not baseline-aligned");
   nscoord sz = aGridItem.mBaselineOffset[aAxis] +
     nsLayoutUtils::MinSizeContributionForAxis(axis, aRC, child,
-                                              nsLayoutUtils::MIN_ISIZE);
+                                              nsLayoutUtils::MIN_ISIZE,
+                                              *aCache->mPercentageBasis);
   const nsStyleCoord& style = axis == eAxisHorizontal ? stylePos->mMinWidth
                                                       : stylePos->mMinHeight;
   auto unit = style.GetUnit();
@@ -3935,9 +3989,6 @@ MinSize(const GridItemInfo&    aGridItem,
        child->StyleDisplay()->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE)) {
     // Now calculate the "content size" part and return whichever is smaller.
     MOZ_ASSERT(unit != eStyleUnit_Enumerated || sz == NS_UNCONSTRAINEDSIZE);
-    if (aCache->mPercentageBasis.isNothing()) {
-      aCache->mPercentageBasis.emplace(aState.PercentageBasisFor(aAxis, aGridItem));
-    }
     sz = std::min(sz, ContentContribution(aGridItem, aState, aRC, aCBWM, aAxis,
                                           aCache->mPercentageBasis,
                                           nsLayoutUtils::MIN_ISIZE,
@@ -3974,28 +4025,16 @@ nsGridContainerFrame::Tracks::CalculateSizes(
   }
 }
 
-bool
-nsGridContainerFrame::Tracks::HasIntrinsicButNoFlexSizingInRange(
-  const LineRange&      aRange,
-  TrackSize::StateBits* aState) const
+TrackSize::StateBits
+nsGridContainerFrame::Tracks::StateBitsForRange(const LineRange& aRange) const
 {
-  MOZ_ASSERT(!aRange.IsAuto(), "must have a definite range");
+  TrackSize::StateBits state = TrackSize::StateBits(0);
   const uint32_t start = aRange.mStart;
   const uint32_t end = aRange.mEnd;
-  const TrackSize::StateBits selector =
-    TrackSize::eIntrinsicMinSizing | TrackSize::eIntrinsicMaxSizing;
-  bool foundIntrinsic = false;
   for (uint32_t i = start; i < end; ++i) {
-    TrackSize::StateBits state = mSizes[i].mState;
-    *aState |= state;
-    if (state & TrackSize::eFlexMaxSizing) {
-      return false;
-    }
-    if (state & selector) {
-      foundIntrinsic = true;
-    }
+    state |= mSizes[i].mState;
   }
-  return foundIntrinsic;
+  return state;
 }
 
 bool
@@ -4010,6 +4049,13 @@ nsGridContainerFrame::Tracks::ResolveIntrinsicSizeStep1(
   CachedIntrinsicSizes cache;
   TrackSize& sz = mSizes[aRange.mStart];
   WritingMode wm = aState.mWM;
+
+  // Check if we need to apply "Automatic Minimum Size" and cache it.
+  if ((sz.mState & TrackSize::eAutoMinSizing) &&
+      aGridItem.ShouldApplyAutoMinSize(wm, mAxis, aPercentageBasis)) {
+    aGridItem.mState[mAxis] |= ItemState::eApplyAutoMinSize;
+  }
+
   // Calculate data for "Automatic Minimum Size" clamping, if needed.
   bool needed = ((sz.mState & TrackSize::eIntrinsicMinSizing) ||
                  aConstraint == SizingConstraint::eNoConstraint) &&
@@ -4370,6 +4416,55 @@ nsGridContainerFrame::Tracks::AlignBaselineSubtree(
   }
 }
 
+template<nsGridContainerFrame::Tracks::TrackSizingPhase phase>
+bool
+nsGridContainerFrame::Tracks::GrowSizeForSpanningItems(
+  nsTArray<Step2ItemData>::iterator aIter,
+  const nsTArray<Step2ItemData>::iterator aIterEnd,
+  nsTArray<uint32_t>& aTracks,
+  nsTArray<TrackSize>& aPlan,
+  nsTArray<TrackSize>& aItemPlan,
+  TrackSize::StateBits aSelector,
+  const FitContentClamper& aFitContentClamper,
+  bool aNeedInfinitelyGrowableFlag)
+{
+  constexpr bool isMaxSizingPhase =
+    phase == TrackSizingPhase::eIntrinsicMaximums ||
+    phase == TrackSizingPhase::eMaxContentMaximums;
+  bool needToUpdateSizes = false;
+  InitializePlan<phase>(aPlan);
+  for (; aIter != aIterEnd; ++aIter) {
+    const Step2ItemData& item = *aIter;
+    if (!(item.mState & aSelector)) {
+      continue;
+    }
+    if (isMaxSizingPhase) {
+      for (auto j = item.mLineRange.mStart, end = item.mLineRange.mEnd; j < end; ++j) {
+        aPlan[j].mState |= TrackSize::eModified;
+      }
+    }
+    nscoord space = item.SizeContributionForPhase<phase>();
+    if (space <= 0) {
+      continue;
+    }
+    aTracks.ClearAndRetainStorage();
+    space = CollectGrowable<phase>(space, item.mLineRange, aSelector,
+                                   aTracks);
+    if (space > 0) {
+      DistributeToTrackSizes<phase>(space, aPlan, aItemPlan, aTracks, aSelector,
+                                    aFitContentClamper);
+      needToUpdateSizes = true;
+    }
+  }
+  if (isMaxSizingPhase) {
+    needToUpdateSizes = true;
+  }
+  if (needToUpdateSizes) {
+    CopyPlanToSize<phase>(aPlan, aNeedInfinitelyGrowableFlag);
+  }
+  return needToUpdateSizes;
+}
+
 void
 nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
   GridReflowInput&            aState,
@@ -4379,21 +4474,6 @@ nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
   nscoord                     aPercentageBasis,
   SizingConstraint            aConstraint)
 {
-  // Some data we collect on each item for Step 2 of the algorithm below.
-  struct Step2ItemData
-  {
-    uint32_t mSpan;
-    TrackSize::StateBits mState;
-    LineRange mLineRange;
-    nscoord mMinSize;
-    nscoord mMinContentContribution;
-    nscoord mMaxContentContribution;
-    nsIFrame* mFrame;
-    static bool IsSpanLessThan(const Step2ItemData& a, const Step2ItemData& b)
-    {
-      return a.mSpan < b.mSpan;
-    }
-  };
 
   // Resolve Intrinsic Track Sizes
   // http://dev.w3.org/csswg/css-grid/#algo-content
@@ -4418,12 +4498,10 @@ nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
   for (; !iter.AtEnd(); iter.Next()) {
     auto& gridItem = aGridItems[iter.GridItemIndex()];
 
-    // Check if we need to apply "Automatic Minimum Size" and cache it.
-    MOZ_ASSERT(!(gridItem.mState[mAxis] & ItemState::eApplyAutoMinSize),
-               "Why is eApplyAutoMinSize set already?");
-    if (gridItem.ShouldApplyAutoMinSize(wm, mAxis, aPercentageBasis)) {
-      gridItem.mState[mAxis] |= ItemState::eApplyAutoMinSize;
-    }
+    MOZ_ASSERT(!(gridItem.mState[mAxis] &
+                 (ItemState::eApplyAutoMinSize | ItemState::eIsFlexing |
+                  ItemState::eClampMarginBoxMinSize)),
+               "Why are any of these bits set already?");
 
     const GridArea& area = gridItem.mArea;
     const LineRange& lineRange = area.*aRange;
@@ -4435,8 +4513,17 @@ nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
         gridItem.mState[mAxis] |= ItemState::eIsFlexing;
       }
     } else {
-      TrackSize::StateBits state = TrackSize::StateBits(0);
-      if (HasIntrinsicButNoFlexSizingInRange(lineRange, &state)) {
+      TrackSize::StateBits state = StateBitsForRange(lineRange);
+
+      // Check if we need to apply "Automatic Minimum Size" and cache it.
+      if ((state & TrackSize::eAutoMinSizing) &&
+          gridItem.ShouldApplyAutoMinSize(wm, mAxis, aPercentageBasis)) {
+        gridItem.mState[mAxis] |= ItemState::eApplyAutoMinSize;
+      }
+
+      if ((state & (TrackSize::eIntrinsicMinSizing |
+                    TrackSize::eIntrinsicMaxSizing)) &&
+          !(state & TrackSize::eFlexMaxSizing)) {
         // Collect data for Step 2.
         maxSpan = std::max(maxSpan, span);
         if (span >= stateBitsPerSpan.Length()) {
@@ -4500,6 +4587,18 @@ nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
 
   // Step 2.
   if (maxSpan) {
+    auto fitContentClamper = [&aFunctions, aPercentageBasis] (uint32_t aTrack,
+                                                              nscoord aMinSize,
+                                                              nscoord* aSize)
+    {
+      nscoord fitContentLimit =
+        ::ResolveToDefiniteSize(aFunctions.MaxSizingFor(aTrack), aPercentageBasis);
+      if (*aSize > fitContentLimit) {
+        *aSize = std::max(aMinSize, fitContentLimit);
+        return true;
+      }
+      return false;
+    };
     // Sort the collected items on span length, shortest first.
     std::stable_sort(step2Items.begin(), step2Items.end(),
                      Step2ItemData::IsSpanLessThan);
@@ -4507,85 +4606,44 @@ nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
     nsTArray<uint32_t> tracks(maxSpan);
     nsTArray<TrackSize> plan(mSizes.Length());
     plan.SetLength(mSizes.Length());
-    for (uint32_t i = 0, len = step2Items.Length(); i < len; ) {
-      // Start / end index for items of the same span length:
-      const uint32_t spanGroupStartIndex = i;
-      uint32_t spanGroupEndIndex = len;
-      const uint32_t span = step2Items[i].mSpan;
-      for (++i; i < len; ++i) {
-        if (step2Items[i].mSpan != span) {
-          spanGroupEndIndex = i;
-          break;
-        }
-      }
-
+    nsTArray<TrackSize> itemPlan(mSizes.Length());
+    itemPlan.SetLength(mSizes.Length());
+    // Start / end iterator for items of the same span length:
+    auto spanGroupStart = step2Items.begin();
+    auto spanGroupEnd = spanGroupStart;
+    const auto end = step2Items.end();
+    for (; spanGroupStart != end; spanGroupStart = spanGroupEnd) {
+      while (spanGroupEnd != end &&
+             !Step2ItemData::IsSpanLessThan(*spanGroupStart, *spanGroupEnd)) {
+        ++spanGroupEnd;
+      }
+
+      const uint32_t span = spanGroupStart->mSpan;
       bool updatedBase = false; // Did we update any mBase in step 2.1 - 2.3?
       TrackSize::StateBits selector(TrackSize::eIntrinsicMinSizing);
       if (stateBitsPerSpan[span] & selector) {
         // Step 2.1 MinSize to intrinsic min-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & selector)) {
-            continue;
-          }
-          nscoord space = item.mMinSize;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, mSizes, item.mLineRange, selector,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackBases(space, plan, tracks, selector);
-            updatedBase = true;
-          }
-        }
+        updatedBase =
+          GrowSizeForSpanningItems<TrackSizingPhase::eIntrinsicMinimums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector);
       }
 
       selector = contentBasedMinSelector;
       if (stateBitsPerSpan[span] & selector) {
         // Step 2.2 MinContentContribution to min-/max-content (and 'auto' when
         // sizing under a min-content constraint) min-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & selector)) {
-            continue;
-          }
-          nscoord space = item.mMinContentContribution;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, mSizes, item.mLineRange, selector,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackBases(space, plan, tracks, selector);
-            updatedBase = true;
-          }
-        }
+        updatedBase |=
+          GrowSizeForSpanningItems<TrackSizingPhase::eContentBasedMinimums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector);
       }
 
       selector = maxContentMinSelector;
       if (stateBitsPerSpan[span] & selector) {
         // Step 2.3 MaxContentContribution to max-content (and 'auto' when
         // sizing under a max-content constraint) min-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & selector)) {
-            continue;
-          }
-          nscoord space = item.mMaxContentContribution;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, mSizes, item.mLineRange, selector,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackBases(space, plan, tracks, selector);
-            updatedBase = true;
-          }
-        }
+        updatedBase |=
+          GrowSizeForSpanningItems<TrackSizingPhase::eMaxContentMinimums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector);
       }
 
       if (updatedBase) {
@@ -4596,63 +4654,22 @@ nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
           }
         }
       }
-      if (stateBitsPerSpan[span] & TrackSize::eIntrinsicMaxSizing) {
-        plan = mSizes;
-        for (TrackSize& sz : plan) {
-          if (sz.mLimit == NS_UNCONSTRAINEDSIZE) {
-            // use mBase as the planned limit
-          } else {
-            sz.mBase = sz.mLimit;
-          }
-        }
 
+      selector = TrackSize::eIntrinsicMaxSizing;
+      if (stateBitsPerSpan[span] & selector) {
+        const bool willRunStep2_6 =
+          stateBitsPerSpan[span] & TrackSize::eAutoOrMaxContentMaxSizing;
         // Step 2.5 MinSize to intrinsic max-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & TrackSize::eIntrinsicMaxSizing)) {
-            continue;
-          }
-          nscoord space = item.mMinSize;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, plan, item.mLineRange,
-                                  TrackSize::eIntrinsicMaxSizing,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackLimits(space, plan, tracks, aFunctions,
-                                    aPercentageBasis);
-          }
-        }
-        for (size_t j = 0, len = mSizes.Length(); j < len; ++j) {
-          TrackSize& sz = plan[j];
-          sz.mState &= ~(TrackSize::eFrozen | TrackSize::eSkipGrowUnlimited);
-          if (sz.mLimit != NS_UNCONSTRAINEDSIZE) {
-            sz.mLimit = sz.mBase;  // collect the results from 2.5
-          }
-        }
+        GrowSizeForSpanningItems<TrackSizingPhase::eIntrinsicMaximums>(
+          spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector,
+          fitContentClamper, willRunStep2_6);
 
-        if (stateBitsPerSpan[span] & TrackSize::eAutoOrMaxContentMaxSizing) {
+        if (willRunStep2_6) {
           // Step 2.6 MaxContentContribution to max-content max-sizing.
-          for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-            Step2ItemData& item = step2Items[i];
-            if (!(item.mState & TrackSize::eAutoOrMaxContentMaxSizing)) {
-              continue;
-            }
-            nscoord space = item.mMaxContentContribution;
-            if (space <= 0) {
-              continue;
-            }
-            tracks.ClearAndRetainStorage();
-            space = CollectGrowable(space, plan, item.mLineRange,
-                                    TrackSize::eAutoOrMaxContentMaxSizing,
-                                    tracks);
-            if (space > 0) {
-              DistributeToTrackLimits(space, plan, tracks, aFunctions,
-                                      aPercentageBasis);
-            }
-          }
+          selector = TrackSize::eAutoOrMaxContentMaxSizing;
+          GrowSizeForSpanningItems<TrackSizingPhase::eMaxContentMaximums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector,
+            fitContentClamper);
         }
       }
     }
@@ -4984,6 +5001,7 @@ nsGridContainerFrame::Tracks::AlignJustifyContent(
     default:
       MOZ_ASSERT_UNREACHABLE("unknown align-/justify-content value");
       between = 0; // just to avoid a compiler warning
+      roundingError = 0; // just to avoid a compiler warning
   }
   between += mGridGap;
   for (TrackSize& sz : mSizes) {
@@ -4998,36 +5016,6 @@ nsGridContainerFrame::Tracks::AlignJustifyContent(
   MOZ_ASSERT(!roundingError, "we didn't distribute all rounding error?");
 }
 
-nscoord
-nsGridContainerFrame::Tracks::BackComputedIntrinsicSize(
-  const TrackSizingFunctions& aFunctions,
-  const nsStyleCoord& aGridGap) const
-{
-  // Sum up the current sizes (where percentage tracks were treated as 'auto')
-  // in 'size'.
-  nscoord size = 0;
-  for (size_t i = 0, len = mSizes.Length(); i < len; ++i) {
-    size += mSizes[i].mBase;
-  }
-
-  // Add grid-gap contributions to 'size' and calculate a 'percent' sum.
-  float percent = 0.0f;
-  size_t numTracks = mSizes.Length();
-  if (numTracks > 1) {
-    const size_t gridGapCount = numTracks - 1;
-    nscoord gridGapLength;
-    float gridGapPercent;
-    if (::GetPercentSizeParts(aGridGap, &gridGapLength, &gridGapPercent)) {
-      percent = gridGapCount * gridGapPercent;
-    } else {
-      gridGapLength = aGridGap.ToLength();
-    }
-    size += gridGapCount * gridGapLength;
-  }
-
-  return std::max(0, nsLayoutUtils::AddPercents(size, percent));
-}
-
 void
 nsGridContainerFrame::LineRange::ToPositionAndLength(
   const nsTArray<TrackSize>& aTrackSizes, nscoord* aPos, nscoord* aLength) const
@@ -5077,10 +5065,15 @@ nsGridContainerFrame::LineRange::ToPositionAndLengthForAbsPos(
                             : GridLineSide::eBeforeGridGap;
       nscoord endPos = aTracks.GridLineEdge(mEnd, side);
       *aLength = std::max(aGridOrigin + endPos, 0);
-    } else {
+    } else if (MOZ_LIKELY(mStart != mEnd)) {
       nscoord pos;
       ToPositionAndLength(aTracks.mSizes, &pos, aLength);
       *aPos = aGridOrigin + pos;
+    } else {
+      // The grid area only covers removed 'auto-fit' tracks.
+      nscoord pos = aTracks.GridLineEdge(mStart, GridLineSide::eBeforeGridGap);
+      *aPos = aGridOrigin + pos;
+      *aLength = nscoord(0);
     }
   }
 }
@@ -6188,7 +6181,7 @@ nsGridContainerFrame::Reflow(nsPresContext*           aPresContext,
   LogicalSize computedSize(wm, computedISize, computedBSize);
 
   nscoord consumedBSize = 0;
-  nscoord bSize;
+  nscoord bSize = 0;
   if (!prevInFlow) {
     Grid grid;
     grid.PlaceGridItems(gridReflowInput, aReflowInput.ComputedMinSize(),
@@ -6196,7 +6189,12 @@ nsGridContainerFrame::Reflow(nsPresContext*           aPresContext,
 
     gridReflowInput.CalculateTrackSizes(grid, computedSize,
                                         SizingConstraint::eNoConstraint);
-    bSize = computedSize.BSize(wm);
+    // Note: we can't use GridLineEdge here since we haven't calculated
+    // the rows' mPosition yet (happens in AlignJustifyContent below).
+    for (const auto& sz : gridReflowInput.mRows.mSizes) {
+      bSize += sz.mBase;
+    }
+    bSize += gridReflowInput.mRows.SumOfGridGaps();
   } else {
     consumedBSize = GetConsumedBSize();
     gridReflowInput.InitializeForContinuation(this, consumedBSize);
@@ -6595,8 +6593,14 @@ nsGridContainerFrame::IntrinsicISize(nsRenderingContext* aRenderingContext,
   state.mCols.CalculateSizes(state, state.mGridItems, state.mColFunctions,
                              NS_UNCONSTRAINEDSIZE, &GridArea::mCols,
                              constraint);
-  return state.mCols.BackComputedIntrinsicSize(state.mColFunctions,
-                                               state.mGridStyle->mGridColumnGap);
+  state.mCols.mGridGap =
+    nsLayoutUtils::ResolveGapToLength(state.mGridStyle->mGridColumnGap,
+                                      NS_UNCONSTRAINEDSIZE);
+  nscoord length = 0;
+  for (const TrackSize& sz : state.mCols.mSizes) {
+    length += sz.mBase;
+  }
+  return length + state.mCols.SumOfGridGaps();
 }
 
 nscoord
@@ -7113,6 +7117,9 @@ nsGridContainerFrame::TrackSize::Dump() const
   if (mState & eFrozen) {
     printf("frozen ");
   }
+  if (mState & eModified) {
+    printf("modified ");
+  }
   if (mState & eBreakBefore) {
     printf("break-before ");
   }
diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index ec3568483..57f5c460c 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -25,6 +25,7 @@
 
 #include "CaretAssociationHint.h"
 #include "FrameProperties.h"
+#include "LayoutConstants.h"
 #include "mozilla/layout/FrameChildList.h"
 #include "mozilla/Maybe.h"
 #include "mozilla/WritingModes.h"
@@ -130,30 +131,12 @@ typedef uint32_t nsSplittableType;
 #define NS_FRAME_IS_NOT_SPLITTABLE(type)\
   (0 == ((type) & NS_FRAME_SPLITTABLE))
 
-#define NS_INTRINSIC_WIDTH_UNKNOWN nscoord_MIN
-
 //----------------------------------------------------------------------
 
 #define NS_SUBTREE_DIRTY(_frame)  \
   (((_frame)->GetStateBits() &      \
     (NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) != 0)
 
-/**
- * Constant used to indicate an unconstrained size.
- *
- * @see #Reflow()
- */
-#define NS_UNCONSTRAINEDSIZE NS_MAXSIZE
-
-#define NS_INTRINSICSIZE    NS_UNCONSTRAINEDSIZE
-#define NS_AUTOHEIGHT       NS_UNCONSTRAINEDSIZE
-// +1 is to avoid clamped huge margin values being processed as auto margins
-#define NS_AUTOMARGIN       (NS_UNCONSTRAINEDSIZE + 1)
-#define NS_AUTOOFFSET       NS_UNCONSTRAINEDSIZE
-// NOTE: there are assumptions all over that these have the same value, namely NS_UNCONSTRAINEDSIZE
-//       if any are changed to be a value other than NS_UNCONSTRAINEDSIZE
-//       at least update AdjustComputedHeight/Width and test ad nauseum
-
 // 1 million CSS pixels less than our max app unit measure.
 // For reflowing with an "infinite" available inline space per [css-sizing].
 // (reflowing with an NS_UNCONSTRAINEDSIZE available inline size isn't allowed
@@ -2050,23 +2033,27 @@ public:
   /**
    * Return the horizontal components of padding, border, and margin
    * that contribute to the intrinsic width that applies to the parent.
+   * @param aPercentageBasis the percentage basis to use for padding/margin -
+   *   i.e. the Containing Block's inline-size
    */
   struct IntrinsicISizeOffsetData {
     nscoord hPadding, hBorder, hMargin;
-    float hPctPadding, hPctMargin;
 
     IntrinsicISizeOffsetData()
       : hPadding(0), hBorder(0), hMargin(0)
-      , hPctPadding(0.0f), hPctMargin(0.0f)
     {}
   };
-  virtual IntrinsicISizeOffsetData IntrinsicISizeOffsets() = 0;
+  virtual IntrinsicISizeOffsetData
+  IntrinsicISizeOffsets(nscoord aPercentageBasis = NS_UNCONSTRAINEDSIZE) = 0;
 
   /**
    * Return the bsize components of padding, border, and margin
    * that contribute to the intrinsic width that applies to the parent.
+   * @param aPercentageBasis the percentage basis to use for padding/margin -
+   *   i.e. the Containing Block's inline-size
    */
-  IntrinsicISizeOffsetData IntrinsicBSizeOffsets();
+  IntrinsicISizeOffsetData
+  IntrinsicBSizeOffsets(nscoord aPercentageBasis = NS_UNCONSTRAINEDSIZE);
 
   virtual mozilla::IntrinsicSize GetIntrinsicSize() = 0;
 
diff --git a/layout/generic/test/mochitest.ini b/layout/generic/test/mochitest.ini
index 934ffc8a4..33dacddab 100644
--- a/layout/generic/test/mochitest.ini
+++ b/layout/generic/test/mochitest.ini
@@ -138,3 +138,7 @@ support-files = file_taintedfilters_feDisplacementMap-tainted-1.svg file_tainted
 support-files = file_scroll_position_restore.html
 [test_scroll_animation_restore.html]
 [test_scroll_position_iframe.html]
+[test_grid_track_sizing_algo_001.html]
+skip-if = debug == true # the test is slow
+[test_grid_track_sizing_algo_002.html]
+skip-if = debug == true # the test is slow
diff --git a/layout/generic/test/test_grid_track_sizing_algo_001.html b/layout/generic/test/test_grid_track_sizing_algo_001.html
new file mode 100644
index 000000000..68956c2df
--- /dev/null
+++ b/layout/generic/test/test_grid_track_sizing_algo_001.html
@@ -0,0 +1,1641 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>CSS Grid Test: intrinsic track sizing with spanning items</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1425599">
+  <link rel="help" href="https://drafts.csswg.org/css-grid/#algo-content">
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>        
+  <style type="text/css">
+body,html { color:black; background:white; font-family:monospace; font-size:16px; padding:0; margin:0; }
+* { vertical-align: top; line-height: 1px; }
+
+.grid {
+  display: inline-grid;
+  grid-template-rows: 1px;
+  grid-auto-rows: 10px;
+  border: 1px solid;
+  place-content: start;
+  place-items: start;
+}
+
+x {
+  grid-row: 1;
+  height: 1px;
+  background: grey;
+}
+
+x:nth-child(1) { background: lime; width: 3px; grid-column: 1/span 2; }
+x:nth-child(2) { background: silver; width: 6px; grid-column: 2/span 4; }
+x:nth-child(3) { background: blue; width: 12px; grid-column: 2/span 2; }
+  </style>
+</head>
+<body>
+
+<script>
+let min1 = [
+  "0", "4px"
+];
+let min2 = [
+  "auto", "min-content", "max-content"
+];
+let max1 = [
+  "8px"
+];
+let max2 = [
+  "auto", "min-content", "max-content"
+];
+
+var track = [];
+min1.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max1.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+track.push("fit-content(8px)");
+
+var cols = [];
+track.forEach((c1) =>  {
+  cols.push(c1 + " " + c1 + " " + c1 + " " + c1 + " " + c1);
+  track.forEach((c2) => {
+    if (c1 != c2) {
+      cols.push(c1 + " " + c2 + " " + c2 + " " + c2 + " " + c2);
+      cols.push(c2 + " " + c1 + " " + c1 + " " + c2 + " " + c2);
+    }
+})});
+
+document.body.style.display = 'none';
+cols.forEach((col) => {
+  let grid = document.createElement('div');
+  grid.className = "grid";
+  grid.style.gridTemplateColumns = col;
+  grid.appendChild(document.createElement('x'))
+  grid.appendChild(document.createElement('x'))
+  grid.appendChild(document.createElement('x'))
+  document.body.appendChild(grid);
+});
+document.body.style.display = '';
+</script>
+
+<script>
+var actual = [];
+[...document.querySelectorAll('.grid')].forEach(function(e) {
+  let cs = window.getComputedStyle(e);
+  actual.push([cs.gridTemplateColumns, cs.width]);
+});
+
+function dumpResult() {
+  var s = "";
+  actual.forEach(v => {
+    s += '["' + v[0] + '","' + v[1] + '"],\n';
+  });
+  let pre = document.createElement("pre");
+  pre.innerHTML = s;
+  document.body.appendChild(pre);
+}
+
+let expected = [
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["4px 6px 6px 4px 4px","24px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 4px 4px","24px"],
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+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+];
+
+function test() {
+  ok(expected.length > 0, "sanity check");
+  for (i = 0; i < expected.length; ++i) {
+    var msg = "";
+    if (actual[i][0] != expected[i][0]) {
+      msg = "'grid-template-columns' for grid index " + i + ":\n" + [...document.querySelectorAll('.grid')][i].outerHTML;
+      is(actual[i][0], expected[i][0], msg);
+    }
+    if (actual[i][1] != expected[i][1]) {
+      msg = "'width' for grid index " + i + ":\n" + [...document.querySelectorAll('.grid')][i].outerHTML;
+      is(actual[i][1], expected[i][1], msg);
+    }
+    if (msg != "") {
+      i = expected.length;  // stop after first failed grid by default
+    }
+  }
+  SimpleTest.finish();
+}
+
+</script>
+
+<script>
+window.onload = function() { setTimeout(test, 0); };
+SimpleTest.waitForExplicitFinish();
+</script>
+
+</body>
+</html>
diff --git a/layout/generic/test/test_grid_track_sizing_algo_002.html b/layout/generic/test/test_grid_track_sizing_algo_002.html
new file mode 100644
index 000000000..40f50e20f
--- /dev/null
+++ b/layout/generic/test/test_grid_track_sizing_algo_002.html
@@ -0,0 +1,1641 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>CSS Grid Test: intrinsic track sizing with spanning items</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1425599">
+  <link rel="help" href="https://drafts.csswg.org/css-grid/#algo-content">
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>        
+  <style type="text/css">
+body,html { color:black; background:white; font-family:monospace; font-size:16px; padding:0; margin:0; }
+* { vertical-align: top; line-height: 1px; }
+
+.grid {
+  display: inline-grid;
+  grid-template-rows: 1px;
+  grid-auto-rows: 10px;
+  border: 1px solid;
+  place-content: start;
+  place-items: start;
+}
+
+x {
+  grid-row: 1;
+  height: 1px;
+  background: grey;
+}
+
+x:nth-child(1) { background: lime; width: 3px; grid-column: 1/span 2; }
+x:nth-child(2) { background: silver; width: 6px; grid-column: 2/span 3; }
+x:nth-child(3) { background: blue; width: 12px; grid-column: 1/span 2; }
+  </style>
+</head>
+<body>
+
+<script>
+let min1 = [
+  "0", "4px"
+];
+let min2 = [
+  "auto", "min-content", "max-content"
+];
+let max1 = [
+  "8px"
+];
+let max2 = [
+  "auto", "min-content", "max-content"
+];
+
+var track = [];
+min1.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max1.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+track.push("fit-content(8px)");
+
+var cols = [];
+track.forEach((c1) =>  {
+  cols.push(c1 + " " + c1 + " " + c1 + " " + c1 + " " + c1);
+  track.forEach((c2) => {
+    if (c1 != c2) {
+      cols.push(c1 + " " + c2 + " " + c2 + " " + c2 + " " + c2);
+      cols.push(c2 + " " + c1 + " " + c1 + " " + c2 + " " + c2);
+    }
+})});
+
+document.body.style.display = 'none';
+cols.forEach((col) => {
+  let grid = document.createElement('div');
+  grid.className = "grid";
+  grid.style.gridTemplateColumns = col;
+  grid.appendChild(document.createElement('x'))
+  grid.appendChild(document.createElement('x'))
+  grid.appendChild(document.createElement('x'))
+  document.body.appendChild(grid);
+});
+document.body.style.display = '';
+</script>
+
+<script>
+var actual = [];
+[...document.querySelectorAll('.grid')].forEach(function(e) {
+  let cs = window.getComputedStyle(e);
+  actual.push([cs.gridTemplateColumns, cs.width]);
+});
+
+function dumpResult() {
+  var s = "";
+  actual.forEach(v => {
+    s += '["' + v[0] + '","' + v[1] + '"],\n';
+  });
+  let pre = document.createElement("pre");
+  pre.innerHTML = s;
+  document.body.appendChild(pre);
+}
+
+let expected = [
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["4px 8px 4px 4px 4px","24px"],
+["8px 4px 0px 4px 4px","20px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 8px 8px 8px","36px"],
+["12px 0px 0px 8px 8px","28px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 0px 6px 0px","18px"],
+["6px 6px 4px 4px 4px","24px"],
+["8px 4px 1px 1px 0px","14px"],
+["4px 8px 4px 0px 0px","16px"],
+["8px 4px 1px 1px 0px","14px"],
+["4px 8px 4px 0px 0px","16px"],
+["8px 4px 1px 1px 0px","14px"],
+["4px 8px 4px 0px 0px","16px"],
+["6px 6px 4px 4px 4px","24px"],
+["6px 6px 4px 4px 4px","24px"],
+["6px 6px 4px 4px 4px","24px"],
+["6px 6px 4px 4px 4px","24px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 8px 8px 8px","36px"],
+["8px 4px 4px 8px 8px","32px"],
+["4px 8px 8px 8px 8px","36px"],
+["8px 4px 4px 8px 8px","32px"],
+["4px 8px 8px 8px 8px","36px"],
+["8px 4px 4px 8px 8px","32px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
+["4px 8px 0px 0px 0px","12px"],
+["8px 4px 4px 0px 0px","16px"],
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+["12px 0px 3px 3px 0px","18px"],
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+["12px 0px 3px 3px 0px","18px"],
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+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
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+["8px 4px 4px 4px 4px","24px"],
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+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
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+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
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+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["12px 0px 3px 3px 0px","18px"],
+["0px 12px 0px 0px 0px","12px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["8px 4px 4px 4px 4px","24px"],
+["4px 8px 0px 4px 4px","20px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 8px 8px 8px 8px","38px"],
+["8px 6px 0px 8px 8px","30px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+["6px 6px 0px 0px 0px","12px"],
+];
+
+function test() {
+  ok(expected.length > 0, "sanity check");
+  for (i = 0; i < expected.length; ++i) {
+    var msg = "";
+    if (actual[i][0] != expected[i][0]) {
+      msg = "'grid-template-columns' for grid index " + i + ":\n" + [...document.querySelectorAll('.grid')][i].outerHTML;
+      is(actual[i][0], expected[i][0], msg);
+    }
+    if (actual[i][1] != expected[i][1]) {
+      msg = "'width' for grid index " + i + ":\n" + [...document.querySelectorAll('.grid')][i].outerHTML;
+      is(actual[i][1], expected[i][1], msg);
+    }
+    if (msg != "") {
+      i = expected.length;  // stop after first failed grid by default
+    }
+  }
+  SimpleTest.finish();
+}
+
+</script>
+
+<script>
+window.onload = function() { setTimeout(test, 0); };
+SimpleTest.waitForExplicitFinish();
+</script>
+
+</body>
+</html>
diff --git a/layout/reftests/bugs/403519-2-ref.html b/layout/reftests/bugs/403519-2-ref.html
index e00fb5e24..72176a89a 100644
--- a/layout/reftests/bugs/403519-2-ref.html
+++ b/layout/reftests/bugs/403519-2-ref.html
@@ -17,7 +17,7 @@ table {
 <body>
 <table>
   <tbody><tr>
-    <td colspan="2" style="width: 100%;"><div>&nbsp;</div></td>
+    <td colspan="2"><div>&nbsp;</div></td>
     <td>b</td>
   </tr>
   <tr>
diff --git a/layout/reftests/css-grid/grid-auto-min-sizing-definite-001-ref.html b/layout/reftests/css-grid/grid-auto-min-sizing-definite-001-ref.html
index 8858b4ea8..f2c76f78b 100644
--- a/layout/reftests/css-grid/grid-auto-min-sizing-definite-001-ref.html
+++ b/layout/reftests/css-grid/grid-auto-min-sizing-definite-001-ref.html
@@ -65,32 +65,49 @@ b40 {
 .h.r {
   height: 42px;
   width: 42px;
-  /* This margin-left is 20% of 98px-wide grid area */
-  margin-left: 19.6px;
-  /* This padding-bottom is 10% of 98px wide grid area */
-  /* This padding-left   is 30% of 98px wide grid area */
-  padding: 1px 3px 9.8px 29.4px;
+  /* 49px is the percentage basis, i.e. the column size */
+  margin-left: calc(0.2 * 49px);
+  padding: 1px 3px calc(0.1 * 49px) calc(0.3 * 49px);
 }
 .v.r {
   height: 42px;
   width: 42px;
-  /* This margin-left is 20% of 54px-wide grid area */
-  margin-left: 10.8px;
-  /* This padding-bottom is 10% of 54px wide grid area */
-  /* This padding-left   is 30% of 54px wide grid area */
-  padding: 1px 3px 5.4px 16.2px;
+  /* 27px is the percentage basis, i.e. the column size */
+  margin-left: calc(0.2 * 27px);
+  padding: 1px 3px calc(0.1 * 27px) calc(0.3 * 27px);
 }
 
 .r { position:relative; }
 
+.t4 { width: 49px;
+      height: calc(10px /* item min-height */ +
+                   7px  /* item margin-top */ +
+                   1px /* item padding-top */ +
+                   1px /* item border-top */ +
+                   calc(0.5 * 49px) /* item margin-bottom */ +
+                   calc(0.1 * 49px) /* item padding-bottom */);
+    }
+
 .t6 { width:46px; }
-.t8 { width:118px; height: 102.5px; }
+.t8 { width: 27px;
+      height: calc(30px /* item min-height */ +
+                   7px  /* item margin-top */ +
+                   3px /* item padding-top */ +
+                   1px /* item border-top */ +
+                   calc(0.5 * 27px) /* item margin-bottom */ +
+                   calc(0.1 * 27px) /* item padding-bottom */);
+    }
 
 xx {
   display: block;
   background: lime;
-  padding:32px 32px 16px 32px;
-  margin: 0 0 32px 16px;
+  padding: 32px 32px calc(0.2 * 32px) calc(0.4 * 32px);
+  margin: 0 0 calc(0.4 * 32px) calc(0.2 * 32px);
+}
+.t9, .t10 {
+  position: relative;
+  z-index: 1;
+  grid: calc(32px + calc(0.4 * 32px) + calc(0.2 * 32px)) 0 / 32px;
 }
   </style>
 </head>
@@ -100,15 +117,15 @@ xx {
 <div class="grid"><span class="h"><x></x></span></div>
 <div class="grid"><span class="h bb"><x></x></span></div>
 <div class="grid"><span class="h"><x></x></span><span class="h"><x></x></span></div>
-<div class="grid" style="grid:48px / 122px"><span class="h r"><b40></b40></span></div>
+<div class="grid t4"><span class="h r"><b40></b40></span></div>
 <br>
 <div class="grid"><span class="v"><x></x></span></div>
-<div class="grid t6"><span class="v bb"><x></x></span></div>
+<div class="grid"><span class="v bb"><x></x></span></div>
 <div class="grid"><span class="v"><x></x></span><span class="v"><x></x></span></div>
 <div class="grid t8"><span class="v r"><b40></b40></span></div>
 
-<div class="grid"><xx class="v"></xx></div>
-<div class="grid v"><xx class="h"></xx></div>
+<div class="grid t9"><xx class="v"></xx></div>
+<div class="grid v t10"><xx class="h"></xx></div>
 
 </body>
 </html>
diff --git a/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-002-ref.html b/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-002-ref.html
index 35f596928..183f00e24 100644
--- a/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-002-ref.html
+++ b/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-002-ref.html
@@ -36,7 +36,7 @@ var coltest = [
 "min-height:40%", "min-height:40%; max-width:30px"
 ];
 var results = [
-"360px", "360px", "360px", "24px", "24px", "360px", "80px", "24px", "24px", "24px",
+"24px", "24px", "24px", "24px", "24px", "24px", "80px", "24px", "24px", "24px",
 "24px", "24px", "24px"
 ];
 var item_width = [
diff --git a/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-004-ref.html b/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-004-ref.html
index caef8b031..6533c97b6 100644
--- a/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-004-ref.html
+++ b/layout/reftests/css-grid/grid-auto-min-sizing-min-content-min-size-004-ref.html
@@ -36,7 +36,7 @@ var rowtest = [
 "min-width:80%; max-height:20px", "min-width:50%", "margin-left: 50px; width:50%"
 ];
 var results = [
-"0/2px", "0/2px", "0/4px", "0/2px", "0/2px", "0/2px", "12px/2px", "20px/2px", "20px/2px", "24px/2px", "24px/52px"
+"0/2px", "0/2px", "0/4px", "0/2px", "0/2px", "0/2px", "12px/2px", "20px/2px", "20px/2px", "24px/2px", "312px/52px"
 ];
 var item_height = [
 "0", "0", "0", "0", "0", "0", "12px", "20px", "20px", "24px", "312px"
diff --git a/layout/reftests/css-grid/grid-auto-min-sizing-percent-001-ref.html b/layout/reftests/css-grid/grid-auto-min-sizing-percent-001-ref.html
index fd2302add..d435f8f3e 100644
--- a/layout/reftests/css-grid/grid-auto-min-sizing-percent-001-ref.html
+++ b/layout/reftests/css-grid/grid-auto-min-sizing-percent-001-ref.html
@@ -54,9 +54,9 @@ br { clear:both; }
 .c10 { grid-template-columns: minmax(10px,0) 1fr; }
 #px-border .c10 { grid-template-columns: minmax(30px,0) 1fr; }
 
-#percent-border .c100 { grid-template-columns: 111px 0; }
-#percent-border .c100calc100 { grid-template-columns: 100px 11px; }
-#percent-border .c10 { grid-template-columns: minmax(11px,0) 0; }
+#percent-border .c100 { grid-template-columns: 100px 0; }
+#percent-border .c100calc100 { grid-template-columns: 100px 10px; }
+#percent-border .c10 { grid-template-columns: minmax(10px,0) 0; }
 #percent-border .c100100 { grid-template-columns: minmax(100px,0) 150px; }
 #percent-border .c200 { grid-template-columns: 250px; }
   </style>
@@ -99,7 +99,7 @@ var grids = [
 "grid c100",
 "grid c100",
 "grid",
-"grid c200",
+"grid c100",
 "grid c10",
 "grid c100",
 "grid c100",
@@ -110,7 +110,7 @@ var grids = [
 "grid c100",
 "grid c100",
 "grid",
-"grid c200",
+"grid c100",
 "grid c10",
 "grid c100",
 "grid c100",
diff --git a/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-002-ref.html b/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-002-ref.html
index 8dcdd563b..528d63bc7 100644
--- a/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-002-ref.html
+++ b/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-002-ref.html
@@ -36,7 +36,7 @@ var coltest = [
 "min-height:40%", "min-height:40%; max-width:30px"
 ];
 var results = [
-"360px", "360px", "360px", "24px", "24px", "360px", "80px", "24px", "20px", "24px",
+"360px", "0px", "0px", "0px", "24px", "360px", "80px", "24px", "20px", "24px",
 "6px", "24px", "24px"
 ];
 var item_width = [
diff --git a/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-004-ref.html b/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-004-ref.html
index 36a2d4920..4eb623b7d 100644
--- a/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-004-ref.html
+++ b/layout/reftests/css-grid/grid-auto-min-sizing-transferred-size-004-ref.html
@@ -36,7 +36,7 @@ var rowtest = [
 "min-width:80%; max-height:20px", "min-width:50%", "margin-left: 50px; width:50%"
 ];
 var results = [
-"0/2px", "0/2px", "0/4px", "0/2px", "0/2px", "0/2px", "12px/2px", "20px/2px", "20px/2px", "24px/2px", "24px/52px"
+"0/2px", "0/2px", "0/4px", "0/2px", "0/2px", "0/2px", "12px/2px", "20px/2px", "20px/2px", "24px/2px", "312px/52px"
 ];
 var item_height = [
 "0", "0", "0", "0", "0", "0", "12px", "20px", "20px", "24px", "312px"
diff --git a/layout/reftests/css-grid/grid-col-max-sizing-max-content-001-ref.html b/layout/reftests/css-grid/grid-col-max-sizing-max-content-001-ref.html
index eda06249b..da30a8b89 100644
--- a/layout/reftests/css-grid/grid-col-max-sizing-max-content-001-ref.html
+++ b/layout/reftests/css-grid/grid-col-max-sizing-max-content-001-ref.html
@@ -17,9 +17,9 @@ body,html { color:black; background:white; font-size:16px; padding:0; margin:0;
  clear:left;
 }
 
-.c1 { min-width:40px; margin-bottom: 2px; margin-right: 47px; }
+.c1 { width:40px; margin-bottom: 2px; margin-right: 47px; }
 .r1 { min-width:70px; margin-left: 38px; margin-top: 2px; }
-.c3 { min-width:0; margin: 2px 18px 1px 85px; }
+.c3 { width:10px; margin: 2px 18px 1px 71px; }
 
 span {
   display: block;
@@ -52,21 +52,22 @@ x { display:inline-block; width:10px; height:18px; }
 <span class="r1"><x>&nbsp;</x></span>
 <span class="r1"><x>&nbsp;</x></span>
 </div>
+
 <div class="grid" style="width:436px">
-<span class="c1" style="margin-right:41px"><x>&nbsp;</x></span>
+<span class="c1" style="width:374px; margin-right:41px"><x>&nbsp;</x></span>
 <span class="r1" style="margin-left:5px"><x>&nbsp;</x></span>
 <span class="c3" style="margin-left:405px; float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div>
 
 <div class="grid" style="width:500px;">
-<span class="c1" style="min-width:20px;margin-right:448px"><x>&nbsp;</x></span>
+<span class="c1" style="width:20px;margin-right:448px"><x>&nbsp;</x></span>
 <span class="r1" style="min-width:10px;margin-left:28px; margin-right:426px"><x>&nbsp;</x></span>
 <span class="r1" style="min-width:30px;margin-left:28px; margin-right:426px"><x>&nbsp;</x></span>
 <span class="r1" style="min-width:10px;margin-left:28px; margin-right:426px"><x>&nbsp;</x></span>
 </div>
 
 <div class="grid" style="width:583px;">
-<span class="c1" style="margin-right:55px"><x>&nbsp;</x></span>
+<span class="c1" style="width:507px; margin-right:55px"><x>&nbsp;</x></span>
 <span class="r1"><x>&nbsp;</x></span>
 <span class="c3" style="margin-left:538px; float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div>
@@ -74,13 +75,13 @@ x { display:inline-block; width:10px; height:18px; }
 <div class="grid" style="width:389px;">
 <span class="c1" style="width:100px"><x>&nbsp;</x></span>
 <span class="r1" style="width:300px;margin-left:68px;"><x>&nbsp;</x></span>
-<span class="c3" style="margin-left:245px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
+<span class="c3" style="margin-left:131px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div>
 
 <div class="grid" style="width:389px;">
 <span class="c1" style="width:100px"><x>&nbsp;</x></span>
 <span class="r1" style="width:300px;margin-left:68px;"><x>&nbsp;</x></span>
-<span class="c3" style="margin-left:245px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
+<span class="c3" style="margin-left:131px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div>
 
 
diff --git a/layout/reftests/css-grid/grid-col-max-sizing-max-content-002-ref.html b/layout/reftests/css-grid/grid-col-max-sizing-max-content-002-ref.html
index 23ca12e7b..eeb4e407f 100644
--- a/layout/reftests/css-grid/grid-col-max-sizing-max-content-002-ref.html
+++ b/layout/reftests/css-grid/grid-col-max-sizing-max-content-002-ref.html
@@ -21,9 +21,9 @@ body,html { color:black; background:white; font-size:16px; padding:0; margin:0;
  clear:left;
 }
 
-.c1 { min-width:40px; margin-bottom: 2px; margin-right: 47px; }
+.c1 { width:40px; margin-bottom: 2px; margin-right: 47px; }
 .r1 { min-width:70px; margin-left: 38px; margin-top: 2px; }
-.c3 { min-width:0; margin: 2px 18px 1px 85px; }
+.c3 { width:10px; margin: 2px 18px 1px 71px; }
 
 span {
   display: block;
@@ -56,21 +56,22 @@ x { display:inline-block; width:10px; height:18px; }
 <span class="r1"><x>&nbsp;</x></span>
 <span class="r1"><x>&nbsp;</x></span>
 </div></div>
+
 <div class="wrap"><div class="grid" style="width:436px">
-<span class="c1" style="margin-right:41px"><x>&nbsp;</x></span>
+<span class="c1" style="width:374px; margin-right:41px"><x>&nbsp;</x></span>
 <span class="r1" style="margin-left:5px"><x>&nbsp;</x></span>
 <span class="c3" style="margin-left:405px; float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div></div>
 
 <div class="wrap" style="float:left;"><div class="grid" style="width:500px;">
-<span class="c1" style="min-width:20px;margin-right:448px"><x>&nbsp;</x></span>
+<span class="c1" style="width:20px;margin-right:448px"><x>&nbsp;</x></span>
 <span class="r1" style="min-width:10px;margin-left:28px; margin-right:426px"><x>&nbsp;</x></span>
 <span class="r1" style="min-width:30px;margin-left:28px; margin-right:426px"><x>&nbsp;</x></span>
 <span class="r1" style="min-width:10px;margin-left:28px; margin-right:426px"><x>&nbsp;</x></span>
 </div></div>
 
 <div class="wrap"><div class="grid" style="width:583px;">
-<span class="c1" style="margin-right:55px"><x>&nbsp;</x></span>
+<span class="c1" style="width:507px; margin-right:55px"><x>&nbsp;</x></span>
 <span class="r1"><x>&nbsp;</x></span>
 <span class="c3" style="margin-left:538px; float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div></div>
@@ -78,13 +79,13 @@ x { display:inline-block; width:10px; height:18px; }
 <div class="wrap"><div class="grid" style="width:389px;">
 <span class="c1" style="width:100px"><x>&nbsp;</x></span>
 <span class="r1" style="width:300px;margin-left:68px;"><x>&nbsp;</x></span>
-<span class="c3" style="margin-left:245px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
+<span class="c3" style="margin-left:131px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div></div>
 
 <div class="wrap"><div class="grid" style="width:389px;">
 <span class="c1" style="width:100px"><x>&nbsp;</x></span>
 <span class="r1" style="width:300px;margin-left:68px;"><x>&nbsp;</x></span>
-<span class="c3" style="margin-left:245px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
+<span class="c3" style="margin-left:131px;float:left;margin-top:1px;"><x>&nbsp;</x></span>
 </div></div>
 
 
diff --git a/layout/reftests/css-grid/grid-flex-min-sizing-002-ref.html b/layout/reftests/css-grid/grid-flex-min-sizing-002-ref.html
index d9af7e43c..d811447ff 100644
--- a/layout/reftests/css-grid/grid-flex-min-sizing-002-ref.html
+++ b/layout/reftests/css-grid/grid-flex-min-sizing-002-ref.html
@@ -127,10 +127,10 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
 }
 
 .gF {
- grid-template-columns: 22px
-                        1px
-                        1px
-                        auto;
+ grid-template-columns: 2px
+                        20px
+                        2px
+                        0;
 }
 
 
diff --git a/layout/reftests/css-grid/grid-item-sizing-percent-003-ref.html b/layout/reftests/css-grid/grid-item-sizing-percent-003-ref.html
index fb4d15ff8..a55dcc989 100644
--- a/layout/reftests/css-grid/grid-item-sizing-percent-003-ref.html
+++ b/layout/reftests/css-grid/grid-item-sizing-percent-003-ref.html
@@ -69,67 +69,67 @@ a {
 
 <div style="float:left">
 <div class="grid" style="grid-template-rows:calc(12px)"><div class="item"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(15px/.9)"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:20px"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
 <div class="grid" style="grid-template-rows:calc(18px)"><div class="item pbox b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(21px/0.9)"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(21px/.9)"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(21px/.9)"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:26px"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 36px"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 36px"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <div style="float:left" class="maxw">
 <div class="grid" style="grid-template-rows:calc(12px)"><div class="item"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(15px/.9)"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:20px"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
 <div class="grid" style="grid-template-rows:calc(18px)"><div class="item pbox b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(21px/.9)"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(21px/.9)"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(21px/.9)"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:26px"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 36px"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 36px"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <div style="float:left" class="minw">
 <div class="grid" style="grid-template-rows:calc(12px)"><div class="item"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(15px/.9)"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:20px"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
 <div class="grid" style="grid-template-rows:calc(18px)"><div class="item pbox b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(21px/.9)"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(21px/.9)"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(21px/.9)"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:26px"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 36px"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 36px"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <div style="float:left">
-<div class="grid" style="grid-template-rows:calc(15px/.9)"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(22.5px)"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(30px)"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(30px)"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:20px"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:28px"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:34px"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 54px"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <br clear="all">
 
 <div style="float:left" class="maxw">
-<div class="grid" style="grid-template-rows:calc(15px/.9)"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(22.5px)"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(30px)"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(30px)"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:20px"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:28px"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:34px"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 54px"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <div style="float:left" class="minw">
-<div class="grid" style="grid-template-rows:calc(15px/.9)"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(15px/.9)"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(22.5px)"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:calc(30px)"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-rows:0 calc(30px)"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:20px"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 30px"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:28px"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:34px"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-rows:0 54px"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 
diff --git a/layout/reftests/css-grid/grid-item-sizing-percent-004-ref.html b/layout/reftests/css-grid/grid-item-sizing-percent-004-ref.html
index 51f71e662..96365b468 100644
--- a/layout/reftests/css-grid/grid-item-sizing-percent-004-ref.html
+++ b/layout/reftests/css-grid/grid-item-sizing-percent-004-ref.html
@@ -62,71 +62,71 @@ a {
 
 <div style="float:left">
 <div class="grid" style="grid-template-columns:calc(10px)"><div class="item"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(18.75px)"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(43.75px)"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(43.75px)"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(18.75px)"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:15px"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 15px"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
 <div class="grid" style="grid-template-columns:calc(16px)"><div class="item pbox b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(26.25px)"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(51.25px)"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(26.25px)"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:21px"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 41px"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 21px"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <br clear="all">
 
 <div style="float:left" class="maxw">
 <div class="grid" style="grid-template-columns:calc(30px)"><div class="item"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(43.75px)"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(43.75px)"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(43.75px)"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(43.75px)"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:35px"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
 <div class="grid" style="grid-template-columns:calc(36px)"><div class="item pbox b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(51.25px)"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(51.25px)"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(51.25px)"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:41px"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 41px"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 41px"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <br clear="all">
 
 <div style="float:left" class="minw">
 <div class="grid" style="grid-template-columns:calc(10px)"><div class="item"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(18.75px)"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(43.75px)"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(43.75px)"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(18.75px)"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:15px"><div class="item pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 pbox p"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 15px"><div class="item c2 pbox p"><x></x><x></x><x></x></div><a></a></div>
 <div class="grid" style="grid-template-columns:calc(16px)"><div class="item pbox b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(26.25px)"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(51.25px)"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(26.25px)"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:21px"><div class="item pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 41px"><div class="item c1 pbox p b"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 21px"><div class="item c2 pbox p b"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <div style="float:left">
-<div class="grid" style="grid-template-columns:calc(15px/.9)"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(35px/.9)"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(15px/.9)"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(20px/.7)"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(37.15px)"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(37.15px)"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:15px"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 15px"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:20px"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:26px"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 26px"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <br clear="all">
 
 <div style="float:left" class="maxw">
-<div class="grid" style="grid-template-columns:calc(35px/.9)"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(35px/.9)"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(35px/.9)"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(57.15px)"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(46px/.7)"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(46px/.7)"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:35px"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:40px"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:46px"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 46px"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 <div style="float:left" class="minw">
-<div class="grid" style="grid-template-columns:calc(15px/.9)"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(35px/.9)"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(15px/.9)"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(20px/.7)"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:calc(37.15px)"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
-<div class="grid" style="grid-template-columns:0 calc(37.15px)"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:15px"><div class="item pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 35px"><div class="item c1 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 15px"><div class="item c2 pbox m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:20px"><div class="item pbox p m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:26px"><div class="item pbox p b m"><x></x><x></x><x></x></div><a></a></div>
+<div class="grid" style="grid-template-columns:0 26px"><div class="item c2 pbox p b m"><x></x><x></x><x></x></div><a></a></div>
 </div>
 
 
diff --git a/layout/reftests/css-grid/grid-max-sizing-flex-004-ref.html b/layout/reftests/css-grid/grid-max-sizing-flex-004-ref.html
index 6446c0ee6..b0ac02bf5 100644
--- a/layout/reftests/css-grid/grid-max-sizing-flex-004-ref.html
+++ b/layout/reftests/css-grid/grid-max-sizing-flex-004-ref.html
@@ -51,8 +51,8 @@ x { display:inline-block; height:10px; width:18px; }
 <div class="grid flex" style="width:1px;height:1px;"><span class="c1" style="margin-top:1px"><x></x></span></div>
 -->
 
-<div class="grid mm" style="width:0;height:0;"><span class="c1" style="min-width:23px;min-height:10px"><x></x></span><span class="c2" style="position:relative;left:14px;width:18px;min-width:0;z-index:-1"><x></x></span></div>
-<div class="grid mm" style="width:1px;height:1px;"><span class="c1" style="min-width:23px;min-height:10px"><x></x></span><span class="c2" style="position:relative;left:14px;width:18px;min-width:0;z-index:-1"><x></x></span></div>
+<div class="grid mm" style="width:0;height:0;"><span class="c1" style="min-width:18px;min-height:10px"><x></x></span><span class="c2" style="position:relative;left:14px;width:18px;min-width:0;z-index:-1"><x></x></span></div>
+<div class="grid mm" style="width:1px;height:1px;"><span class="c1" style="min-width:18px;min-height:10px"><x></x></span><span class="c2" style="position:relative;left:14px;width:18px;min-width:0;z-index:-1"><x></x></span></div>
 <!-- TODO: fails due to broken align:stretch
 <div class="grid zero" style="width:0;height:0;"><span class="c1"><x></x></span></div>
 <div class="grid zero" style="width:1px;height:1px;"><span class="c1"><x></x></span></div>
diff --git a/layout/reftests/css-grid/grid-percent-grid-gap-001-ref.html b/layout/reftests/css-grid/grid-percent-grid-gap-001-ref.html
index 945b43b52..7ad85e1e5 100644
--- a/layout/reftests/css-grid/grid-percent-grid-gap-001-ref.html
+++ b/layout/reftests/css-grid/grid-percent-grid-gap-001-ref.html
@@ -65,7 +65,7 @@ br { clear: both; }
 </div>
 
 <div class="float">
-<div class="grid" style="align-self:start; justify-self:start; grid-gap:15px">
+<div class="grid" style="width:60px; height:60px; grid-column-gap:12px">
   <span><x></x></span>
   <span><x></x></span>
   <span><x></x></span>
@@ -74,7 +74,7 @@ br { clear: both; }
 </div>
 
 <div class="inline-grid">
-<div class="grid" style="align-self:start; justify-self:start; grid-gap:15px">
+<div class="grid" style="width:60px; height:60px; grid-column-gap:12px; align-self:start; justify-self:start;">
   <span><x></x></span>
   <span><x></x></span>
   <span><x></x></span>
@@ -141,12 +141,12 @@ br { clear: both; }
 </div>
 </div>
 
-<div class="float" style="margin-top:-50px">
-<div class="grid" style="min-width:300%; grid-gap:15px 15px">
-  <span><x></x></span>
-  <span style="margin-left:31px; width:30px"><x></x></span>
-  <span><x></x></span>
-  <span style="margin-left:31px; width:30px"><x></x></span>
+<div class="float" style="margin-top:-50px; width:62px">
+<div class="grid" style="padding-left:186px; height:60px; grid-column-gap:calc(186px * 0.2);">
+  <span style="margin-left:-186px; width:30px"><x></x></span>
+  <span style="margin-left:-186px; width:30px"><x></x></span>
+  <span style="margin-left:-186px; width:30px"><x></x></span>
+  <span style="margin-left:-186px; width:30px"><x></x></span>
 </div>
 </div>
 
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-002-ref.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-002-ref.html
index a404a0905..682e0ca38 100644
--- a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-002-ref.html
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-002-ref.html
@@ -83,12 +83,16 @@ fill,fit {
 
 .zero-progress {
   grid-row-gap: calc(10px - 1%);
-  grid-template-rows: [a] 10px repeat(4, [b] minmax(0,auto) [c]) [d];
+  grid-template-rows: [a] 10px repeat(3, [b] 0 [c]) [d];
 }
 .w50.zero-progress {
   grid-row-gap: calc(10px - 1%);
   grid-template-rows: [a] 10px repeat(3, [b] 0 [c]) [d];
 }
+.mw50.zero-progress {
+  grid-row-gap: calc(10px - 1%);
+  grid-template-rows: [a] 10px repeat(4, [b] 0 [c]) [d];
+}
 </style>
 </head>
 <body>
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-006-ref.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-006-ref.html
index 79ac94548..ab07edd5f 100644
--- a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-006-ref.html
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-006-ref.html
@@ -129,55 +129,55 @@ float { float:left; margin-right:20px; }
 <body>
 
 <float>
-<div class="grid c1 t1 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x5"><x></x><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 <div class="grid c2 t1 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t1 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c2 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t1 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x4"><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 <div class="grid c2 t1 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t1 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 x4"><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c2 t2 x4"><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t2 x4"><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t1 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t1 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t1 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x3"><x></x><x></x><a></a><b></b><f></f><x></x></div>
+<div class="grid c2 t1 x3"><x></x><x></x><a></a><b></b><c></c><e></e><f></f><x></x></div>
+<div class="grid c3 t1 x3"><x></x><x></x><a></a><b></b><c></c><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 x3"><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c2 t2 x3"><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t2 x3"><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 </float>
 
 <float>
-<div class="grid c1 t1 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t1 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t1 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x2"><x></x><a></a><b></b><f></f><x></x></div>
+<div class="grid c2 t1 x2"><x></x><a></a><b></b><c></c><e></e><f></f><x></x></div>
+<div class="grid c3 t1 x2"><x></x><a></a><b></b><c></c><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 x2"><x></x><a></a><b></b><f></f><x></x></div>
+<div class="grid c2 t2 x2"><x></x><a></a><b></b><f></f><x></x></div>
+<div class="grid c3 t2 x2"><x></x><a></a><b></b><f></f><x></x></div>
 
-<div class="grid c1 t1 x1"><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t1 x1"><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t1 x1"><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x1"><a></a><b></b><f></f><x></x></div>
+<div class="grid c2 t1 x1"><a></a><b></b><c></c><e></e><f></f><x></x></div>
+<div class="grid c3 t1 x1"><a></a><b></b><c></c><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 x1"><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 x1"><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 x1"><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 x1"><a></a><b></b><f></f><x></x></div>
+<div class="grid c2 t2 x1"><a></a><b></b><f></f><x></x></div>
+<div class="grid c3 t2 x1"><a></a><b></b><f></f><x></x></div>
 
-<div class="grid c1 t1 x1 p1"><a></a><b></b><c></c><d></d><e></e><f></f></div>
-<div class="grid c2 t1 x1 p1"><a></a><b></b><c></c><d></d><e></e><f></f></div>
-<div class="grid c3 t1 x1 p1"><a></a><b></b><c></c><d></d><e></e><f></f></div>
+<div class="grid c1 t1 x1 p1"><a></a><b></b><f></f></div>
+<div class="grid c2 t1 x1 p1"><a></a><b></b><c></c><e></e><f></f></div>
+<div class="grid c3 t1 x1 p1"><a></a><b></b><c></c><e></e><f></f></div>
 
-<div class="grid c1 t2 x0 p1"><a></a><b></b><c></c><d></d><e></e><f></f></div>
-<div class="grid c2 t2 x0 p1"><a></a><b></b><c></c><d></d><e></e><f></f></div>
-<div class="grid c3 t2 x0 p1"><a></a><b></b><c></c><d></d><e></e><f></f></div>
+<div class="grid c1 t2 x0 p1"><a></a><b></b><f></f></div>
+<div class="grid c2 t2 x0 p1"><a></a><b></b><f></f></div>
+<div class="grid c3 t2 x0 p1"><a></a><b></b><f></f></div>
 </float>
 
 </body>
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-007-ref.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-007-ref.html
index 5f3cebf6a..fd073a072 100644
--- a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-007-ref.html
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-007-ref.html
@@ -146,7 +146,7 @@ float { float:left; margin-right:20px; }
 <div class="grid c2 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t2 x5"><x></x><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t1 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x4"><x></x><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 <div class="grid c2 t1 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t1 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
@@ -154,23 +154,23 @@ float { float:left; margin-right:20px; }
 <div class="grid c2 t2 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t2 x4"><x></x><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t1 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x3"><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 <div class="grid c2 t1 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t1 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 x3"><x></x><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 x3"><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c2 t2 x3"><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t2 x3"><x></x><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 </float>
 
 <float>
-<div class="grid c1 t1 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t1 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t1 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 x2"><x></x><a></a><b></b><f></f><x></x></div>
+<div class="grid c2 t1 x2"><x></x><a></a><b></b><c></c><e></e><f></f><x></x></div>
+<div class="grid c3 t1 x2"><x></x><a></a><b></b><c></c><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 x2"><x></x><a></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 x2"><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c2 t2 x2"><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t2 x2"><x></x><a></a><b></b><d></d><e></e><f></f><x></x></div>
 </float>
 
 </body>
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008-ref.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008-ref.html
index 96f606682..028d9e209 100644
--- a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008-ref.html
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008-ref.html
@@ -139,8 +139,7 @@ float { float:left; margin-right:20px; }
 
 .x2 e { left:23px; width:20px; right:auto; }
 .c2.x2 e { left:20px;  }
-.t1.c3.x2 e { width:40px; }
-.t1.c3.x2 b { width:63px; }
+.t1.c3.x2 e { width:20px; }
 .t1.c3.x2 c { width:20px; right:auto;}
 
 .t2.x5 e { left:23px; width:60px; }
@@ -159,35 +158,35 @@ float { float:left; margin-right:20px; }
 <div class="grid c2 t1 n x5"><x></x><x></x><x></x><x></x><y></y><a style="width:55px"></a><b></b><c></c><d></d><e class="s2a e6a"></e><f class="e5a"></f><x></x></div>
 <div class="grid c3 t1 n x5"><x></x><x></x><x></x><x></x><y></y><y></y><a style="width:47px"></a><b></b><c></c><d></d><e class="s2 e6b"></e><f class="e5b"></f><x></x></div>
 
-<div class="grid c1 t2 m x5"><x></x><x></x><x></x><x></x><y></y><a style="width:82px"></a><b></b><c></c><d></d><e class="s2"></e><f class="e5"></f><x></x></div>
-<div class="grid c2 t2 m x5"><x></x><x></x><x></x><x></x><y></y><a style="width:75px"></a><b></b><c></c><d></d><e class="s2e"></e><f class="e5"></f><x></x></div>
-<div class="grid c3 t2 m x5"><x></x><x></x><x></x><x></x><y></y><y></y><a style="width:67px"></a><b></b><c></c><d></d><e></e><f class="e5"></f><x></x></div>
+<div class="grid c1 t2 m x5"><x></x><x></x><x></x><x></x><y></y><a style="width:82px"></a><b></b><d></d><e class="s2"></e><f class="e5"></f><x></x></div>
+<div class="grid c2 t2 m x5"><x></x><x></x><x></x><x></x><y></y><a style="width:75px"></a><b></b><d></d><e class="s2e"></e><f class="e5"></f><x></x></div>
+<div class="grid c3 t2 m x5"><x></x><x></x><x></x><x></x><y></y><y></y><a style="width:67px"></a><b></b><d></d><e></e><f class="e5"></f><x></x></div>
 
 <div class="grid c1 t1 o x4"><x></x><x></x><x></x><y></y><a style="width:62px"></a><b></b><c></c><d></d><e></e><f class="e5"></f><x></x></div>
 <div class="grid c2 t1 o x4"><x></x><x></x><x></x><y></y><a style="width:55px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t1 o x4"><x></x><x></x><x></x><y></y><y></y><a style="width:47px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 o x4"><x></x><x></x><x></x><y></y><a style="width:102px"></a><b></b><c></c><d></d><e></e><f class="e5"></f><x></x></div>
-<div class="grid c2 t2 o x4"><x></x><x></x><x></x><y></y><a style="width:95px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 o x4"><x></x><x></x><x></x><y></y><y></y><a style="width:87px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 o x4"><x></x><x></x><x></x><y></y><a style="width:102px"></a><b></b><d></d><e></e><f class="e5"></f><x></x></div>
+<div class="grid c2 t2 o x4"><x></x><x></x><x></x><y></y><a style="width:95px"></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t2 o x4"><x></x><x></x><x></x><y></y><y></y><a style="width:87px"></a><b></b><d></d><e></e><f></f><x></x></div>
 
 <div class="grid c1 t1 n x3"><x></x><x></x><y></y><a style="width:62px"></a><b></b><c></c><d></d><e></e><f class="e5"></f><x></x></div>
 <div class="grid c2 t1 n x3"><x></x><x></x><y></y><a style="width:55px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 <div class="grid c3 t1 n x3"><x></x><x></x><y></y><y></y><a style="width:47px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 n x3"><x></x><x></x><y></y><a style="width:102px"></a><b></b><c></c><d></d><e></e><f class="e5"></f><x></x></div>
-<div class="grid c2 t2 n x3"><x></x><x></x><y></y><a style="width:95px"></a><b></b><c></c><d></d><e></e><f class="e5"></f><x></x></div>
-<div class="grid c3 t2 n x3"><x></x><x></x><y></y><y></y><a style="width:87px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 n x3"><x></x><x></x><y></y><a style="width:102px"></a><b></b><d></d><e></e><f class="e5"></f><x></x></div>
+<div class="grid c2 t2 n x3"><x></x><x></x><y></y><a style="width:95px"></a><b></b><d></d><e></e><f class="e5"></f><x></x></div>
+<div class="grid c3 t2 n x3"><x></x><x></x><y></y><y></y><a style="width:87px"></a><b></b><d></d><e></e><f></f><x></x></div>
 </float>
 
 <float>
-<div class="grid c1 t1 n x2"><x></x><y></y><a style="width:122px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t1 n x2"><x></x><y></y><a style="width:115px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t1 n x2"><x></x><y></y><y></y><a style="width:87px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t1 n x2"><x></x><y></y><a style="width:122px"></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c2 t1 n x2"><x></x><y></y><a style="width:115px"></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t1 n x2"><x></x><y></y><y></y><a style="width:107px"></a><b></b><d></d><e></e><f></f><x></x></div>
 
-<div class="grid c1 t2 n x2"><x></x><y></y><a style="width:122px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c2 t2 n x2"><x></x><y></y><a style="width:115px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
-<div class="grid c3 t2 n x2"><x></x><y></y><y></y><a style="width:107px"></a><b></b><c></c><d></d><e></e><f></f><x></x></div>
+<div class="grid c1 t2 n x2"><x></x><y></y><a style="width:122px"></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c2 t2 n x2"><x></x><y></y><a style="width:115px"></a><b></b><d></d><e></e><f></f><x></x></div>
+<div class="grid c3 t2 n x2"><x></x><y></y><y></y><a style="width:107px"></a><b></b><d></d><e></e><f></f><x></x></div>
 </float>
 
 </body>
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008.html
index e821c8d0e..300be60ca 100644
--- a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008.html
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-008.html
@@ -156,32 +156,32 @@ function testGridTemplateColumns(elem, expected) {
   }
 }
 var a1 = [
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px",
 "[a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
-"3px [a b] 20px [c b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px",
-"[a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
-"3px [a b] 20px [c b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
 "3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px",
-"[a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
+"[a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
 "3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c d] 20px",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px",
+"[a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c d] 20px 3px",
+"3px [a b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d] 20px",
 "[a b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c d] 20px 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c d] 20px 3px"
+"3px [a b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c d] 20px 3px"
 ];
 var a2 = [
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c d]",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d]",
 "[a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c d] 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c d] 3px",
-"3px [a b] 20px [c b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d]",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c d] 3px",
+"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c b] 0px [c d]",
 "[a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d] 3px",
-"3px [a b] 20px [c b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c d] 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d]",
+"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d] 3px",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c b] 0px [c d]",
 "[a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d] 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c d] 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d]",
+"3px [a b] 0px [c b] 20px [c b] 20px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d] 3px",
+"3px [a b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c b] 0px [c d]",
 "[a b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d] 3px",
-"3px [a b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c d] 3px"
+"3px [a b] 0px [c b] 20px [c b] 0px [c b] 20px [c b] 0px [c b] 0px [c b] 0px [c d] 3px"
 ];
 function runTest() {
  var t1 = document.querySelectorAll('.t1');
@@ -195,7 +195,7 @@ function runTest() {
 
  document.documentElement.className='';
 }
-document.addEventListener('MozReftestInvalidate', runTest, false);
+document.addEventListener('MozReftestInvalidate', runTest);
 
 </script>
 
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-012-ref.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-012-ref.html
new file mode 100644
index 000000000..04963b45f
--- /dev/null
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-012-ref.html
@@ -0,0 +1,144 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>Reference: repeat(auto-fit) with removed tracks</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1417711">
+  <style type="text/css">
+html,body {
+  color:black; background-color:white; font:16px/1 monospace; padding:0px; margin:0;
+}
+
+.container {
+  width: 200px;
+}
+
+.grid {
+  position: relative;
+  display: grid;
+  grid: 10px / repeat(5, 30px);
+  grid-auto-columns: 2px;
+  background: lightgrey;
+  margin-bottom: 4px;
+  grid-gap: 5px;
+}
+.distribute {
+  grid-gap: 0;
+  align-content: space-around;
+}
+
+span {
+  background: blue;
+  height: 10px;
+}
+
+.abs {
+  position: absolute;
+  top:0; right:0; bottom:0; left:0;
+  grid-column-end: span 1;
+  background: pink;
+}
+
+  </style>
+</head>
+<body>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1 / 2" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1 / 2" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1 / 3" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1 / 2" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1 / auto" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1 / 2" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1 / 2" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1 / 3" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1 / 2" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1 / auto" class="abs"></span>
+</div>
+</div>
+
+</body>
+</html>
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-012.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-012.html
new file mode 100644
index 000000000..7ed0843af
--- /dev/null
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-012.html
@@ -0,0 +1,160 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>CSS Grid Test: repeat(auto-fit) with removed tracks</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1417711">
+  <link rel="help" href="https://drafts.csswg.org/css-grid/#valdef-repeat-auto-fill">
+  <link rel="match" href="grid-repeat-auto-fill-fit-012-ref.html">
+  <style type="text/css">
+html,body {
+  color:black; background-color:white; font:16px/1 monospace; padding:0px; margin:0;
+}
+
+.container {
+  width: 200px;
+}
+
+.grid {
+  position: relative;
+  display: grid;
+  grid: 10px / repeat(auto-fit, 30px);
+  grid-auto-columns: 2px;
+  background: lightgrey;
+  margin-bottom: 4px;
+  grid-gap: 5px;
+}
+.distribute {
+  grid-gap: 0;
+  align-content: space-around;
+}
+
+span {
+  background: blue;
+  height: 10px;
+}
+
+.abs {
+  position: absolute;
+  top:0; right:0; bottom:0; left:0;
+  grid-column-end: span 1;
+  background: pink;
+}
+
+  </style>
+</head>
+<body>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 4 / 5" class="abs"></span>
+<span style="grid-column: 3"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 4 / 5" class="abs"></span>
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 1 / 5" class="abs"></span>
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 2 / 5" class="abs"></span>
+<span style="grid-column: 2"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 2 / 5" class="abs"></span>
+<span style="grid-column: 2 / 4"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 2 / 5" class="abs"></span>
+<span style="grid-column: 4 / 5"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 2 / 5" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid">
+<span style="grid-column: 2 / 10" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 4 / 5" class="abs"></span>
+<span style="grid-column: 3"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 4 / 5" class="abs"></span>
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 1 / 5" class="abs"></span>
+<span style="grid-column: 1"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 2 / 5" class="abs"></span>
+<span style="grid-column: 2"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 2 / 5" class="abs"></span>
+<span style="grid-column: 2 / 4"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 2 / 5" class="abs"></span>
+<span style="grid-column: 4 / 5"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 2 / 5" class="abs"></span>
+</div>
+</div>
+
+<div class="container">
+<div class="grid distribute">
+<span style="grid-column: 2 / 10" class="abs"></span>
+</div>
+</div>
+
+</body>
+</html>
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-013-ref.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-013-ref.html
new file mode 100644
index 000000000..9b8267f88
--- /dev/null
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-013-ref.html
@@ -0,0 +1,116 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+<meta charset="utf-8">
+<title>CSS Grid Test Reference: test auto placement in repeat auto-fit grids with leading implicit tracks</title>
+<style type="text/css">
+body {
+  margin: 10px;
+  font-size: 10px;
+}
+.wrapper {
+  display: grid;
+  width: 600px;
+  background-color: #f00;
+}
+.wrapper > * {
+  background-color: #444;
+  color: #fff;
+}
+
+.templateFit {
+  grid-template-columns: 10px 10px repeat(auto-fill, 40px);
+}
+.templateFixedFit {
+  grid-template-columns: 10px calc(10px + 20px) repeat(auto-fill, 40px);
+}
+.templateFitFixed {
+  grid-template-columns: 10px 10px repeat(auto-fill, 40px) 40px;
+}
+.templateFixedFitFixed {
+  grid-template-columns: 10px calc(10px + 20px) repeat(auto-fill, 40px) 40px;
+}
+
+z {
+  grid-column: 1;
+}
+z::after {
+  content: "Z";
+}
+
+y {
+  grid-column: auto;
+}
+y::after {
+  content: "Y";
+}
+
+
+b {
+  grid-column: 3;
+}
+b::after {
+  content: "B";
+}
+
+c {
+  grid-column: 4;
+}
+c::after {
+  content: "C";
+}
+
+d {
+  grid-column: 5;
+}
+d::after {
+  content: "D";
+}
+
+e {
+  grid-column: 6;
+}
+e::after {
+  content: "E";
+}
+
+f {
+  grid-column: 7;
+}
+f::after {
+  content: "F";
+}
+
+</style>
+</head>
+<body>
+
+<div class="wrapper templateFit"><z></z><b></b><y></y></div>
+<div class="wrapper templateFit"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFit"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFit"><z></z><b></b><d style="grid-column: 4"></d></div>
+<div class="wrapper templateFit"><z></z><b></b><d style="grid-column: 4"></d><f style="grid-column: 5"></f></div>
+
+<div class="wrapper templateFixedFit"><z></z><b></b><y></y></div>
+<div class="wrapper templateFixedFit"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFixedFit"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFixedFit"><z></z><b></b><d style="grid-column: 4"></d></div>
+<div class="wrapper templateFixedFit"><z></z><b></b><d style="grid-column: 4"></d><f style="grid-column: 5"></f></div>
+
+<div class="wrapper templateFitFixed"><z></z><b></b><y></y></div>
+<div class="wrapper templateFitFixed"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFitFixed"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFitFixed"><z></z><b></b><d style="grid-column: 4"></d></div>
+<div class="wrapper templateFitFixed"><z></z><b></b><d style="grid-column: 4"></d><f style="grid-column: 5"></f></div>
+
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><y></y></div>
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><d style="grid-column: 4"></d></div>
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><d style="grid-column: 4"></d><f style="grid-column: 5"></f></div>
+
+</body>
+</html>
diff --git a/layout/reftests/css-grid/grid-repeat-auto-fill-fit-013.html b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-013.html
new file mode 100644
index 000000000..5a9c05d73
--- /dev/null
+++ b/layout/reftests/css-grid/grid-repeat-auto-fill-fit-013.html
@@ -0,0 +1,135 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+<meta charset="utf-8">
+<title>CSS Grid Test: test placement in repeat auto-fit grids with leading implicit tracks</title>
+<link rel="author" title="Brad Werth" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1416350">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#valdef-repeat-auto-fill">
+<link rel="match" href="grid-repeat-auto-fill-fit-013-ref.html">
+<style type="text/css">
+body {
+  margin: 10px;
+  font-size: 10px;
+}
+.wrapper {
+  display: grid;
+  width: 600px;
+  background-color: #f00;
+  grid-auto-columns: 10px;
+  grid-auto-flow: row;
+}
+.wrapper > * {
+  background-color: #444;
+  color: #fff;
+}
+
+.relative {
+  position: relative;
+}
+
+.absposchild {
+  z-index: -1;
+  position: absolute;
+  grid-column-end: span 1;
+  top: 0px;
+  bottom: 0px;
+  left: 0px;
+  right: 0px;
+}
+
+.templateFit {
+  grid-template-columns: repeat(auto-fit, 40px);
+}
+.templateFixedFit {
+  grid-template-columns: 20px repeat(auto-fit, 40px);
+}
+.templateFitFixed {
+  grid-template-columns: repeat(auto-fit, 40px) 40px;
+}
+.templateFixedFitFixed {
+  grid-template-columns: 20px repeat(auto-fit, 40px) 40px;
+}
+
+z {
+  grid-column: -18;
+}
+z::after {
+  content: "Z";
+}
+
+y {
+  grid-column: auto;
+}
+y::after {
+  content: "Y";
+}
+
+
+b {
+  grid-column: 3;
+}
+b::after {
+  content: "B";
+}
+
+c {
+  grid-column: 5;
+}
+c::after {
+  content: "C";
+}
+
+d {
+  grid-column: 7;
+}
+d::after {
+  content: "D";
+}
+
+e {
+  grid-column: 9;
+}
+e::after {
+  content: "E";
+}
+
+f {
+  grid-column: 11;
+}
+f::after {
+  content: "F";
+}
+
+</style>
+</head>
+<body>
+
+<div class="wrapper templateFit"><z></z><b></b><y></y></div>
+<div class="wrapper templateFit"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFit"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFit relative"><z></z><b></b><c class="absposchild"></c><d></d></div>
+<div class="wrapper templateFit relative"><z></z><b></b><c class="absposchild"></c><d></d><e class="absposchild"></e><f></f></div>
+
+<div class="wrapper templateFixedFit"><z></z><b></b><y></y></div>
+<div class="wrapper templateFixedFit"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFixedFit"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFixedFit relative"><z></z><b></b><c class="absposchild"></c><d></d></div>
+<div class="wrapper templateFixedFit relative"><z></z><b></b><c class="absposchild"></c><d></d><e class="absposchild"></e><f></f></div>
+
+<div class="wrapper templateFitFixed"><z></z><b></b><y></y></div>
+<div class="wrapper templateFitFixed"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFitFixed"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFitFixed relative"><z></z><b></b><c class="absposchild"></c><d></d></div>
+<div class="wrapper templateFitFixed relative"><z></z><b></b><c class="absposchild"></c><d></d><e class="absposchild"></e><f></f></div>
+
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><y></y></div>
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><c></c><d></d></div>
+<div class="wrapper templateFixedFitFixed"><z></z><b></b><c></c><d></d><e></e><f></f></div>
+<div class="wrapper templateFixedFitFixed relative"><z></z><b></b><c class="absposchild"></c><d></d></div>
+<div class="wrapper templateFixedFitFixed relative"><z></z><b></b><c class="absposchild"></c><d></d><e class="absposchild"></e><f></f></div>
+
+</body>
+</html>
diff --git a/layout/reftests/css-grid/grid-track-intrinsic-sizing-002-ref.html b/layout/reftests/css-grid/grid-track-intrinsic-sizing-002-ref.html
index 7fb00f1da..23dc42b69 100644
--- a/layout/reftests/css-grid/grid-track-intrinsic-sizing-002-ref.html
+++ b/layout/reftests/css-grid/grid-track-intrinsic-sizing-002-ref.html
@@ -27,34 +27,34 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   background: grey;
 }
 .g1 .d1 {
-  width: 52px;
+  width: 0px;
 }
 .g2 .d1 {
-  width: 56px;
+  width: 0px;
 }
 .g2f .d1 {
-  width: 69px;
+  width: 0px;
 }
 .g3 .d1 {
-  width: 56px;
+  width: 0px;
 }
 .g4 .d1 {
-  width: 96px;
+  width: 80px;
 }
 .g4f .d1 {
-  width: 69px;
+  width: 0px;
 }
 .g5 .d1 {
-  width: 96px;
+  width: 80px;
 }
 .g6 .d1 {
-  width: 69px;
+  width: 0px;
 }
 .g6f .d1 {
-  width: 69px;
+  width: 0px;
 }
 .g7 .d1 {
-  width: 69px;
+  width: 0px;
 }
 .g8 .t {
   width: 196px;
@@ -63,19 +63,19 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   width: 200px;
 }
 .g9 .d1 {
-  width: 69px;
+  width: 0px;
 }
 .gA .d1 {
-  width: 93px;
+  width: 80px;
 }
 .gB .d1 {
-  width: 93px;
+  width: 80px;
 }
 .gC .d1 {
-  width: 93px;
+  width: 80px;
 }
 .gD .d1 {
-  width: 93px;
+  width: 80px;
 }
 
 .t { grid-column: span 1; border:2px solid; }
diff --git a/layout/reftests/css-grid/grid-track-intrinsic-sizing-003-ref.html b/layout/reftests/css-grid/grid-track-intrinsic-sizing-003-ref.html
index bc52f4ca0..01739578c 100644
--- a/layout/reftests/css-grid/grid-track-intrinsic-sizing-003-ref.html
+++ b/layout/reftests/css-grid/grid-track-intrinsic-sizing-003-ref.html
@@ -27,34 +27,34 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   background: grey;
 }
 .g1 .d1 {
-  width: 52px;
+  width: 0px;
 }
 .g2 .d1 {
-  width: 56px;
+  width: 0px;
 }
 .g2f .d1 {
   width: 69px;
 }
 .g3 .d1 {
-  width: 56px;
+  width: 0px;
 }
 .g4 .d1 {
-  width: 96px;
+  width: 80px;
 }
 .g4f .d1 {
   width: 104px;
 }
 .g5 .d1 {
-  width: 96px;
+  width: 80px;
 }
 .g6 .d1 {
-  width: 69px;
+  width: 0px;
 }
 .g6f .d1 {
   width: 89px;
 }
 .g7 .d1 {
-  width: 69px;
+  width: 0px;
 }
 .g8 .t {
   width: 196px;
@@ -63,19 +63,19 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   width: 200px;
 }
 .g9 .d1 {
-  width: 69px;
+  width: 0px;
 }
 .gA .d1 {
-  width: 93px;
+  width: 80px;
 }
 .gB .d1 {
-  width: 93px;
+  width: 80px;
 }
 .gC .d1 {
-  width: 93px;
+  width: 80px;
 }
 .gD .d1 {
-  width: 93px;
+  width: 80px;
 }
 .d2 {
   position: absolute;
@@ -84,10 +84,10 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   background: blue;
 }
 .g1 .d2 {
-  width: 448px;
+  width: 500px;
 }
 .g2 .d2 {
-  width: 444px;
+  width: 500px;
 }
 .g2f .d2 {
   right: auto;
@@ -95,10 +95,10 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   width: 35px;
 }
 .g3 .d2 {
-  width: 444px;
+  width: 500px;
 }
 .g4 .d2 {
-  width: 404px;
+  width: 420px;
 }
 .g4f .d2 {
   right: auto;
@@ -106,10 +106,10 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   width: 35px;
 }
 .g5 .d2 {
-  width: 404px;
+  width: 420px;
 }
 .g6 .d2 {
-  width: 431px;
+  width: 500px;
 }
 .g6f .d2 {
   right: auto;
@@ -117,25 +117,25 @@ body,html { color:black; background:white; font-family:monospace; font-size:16px
   width: 35px;
 }
 .g7 .d2 {
-  width: 431px;
+  width: 500px;
 }
 .g8 .d2 {
   width: 300px;
 }
 .g9 .d2 {
-  width: 431px;
+  width: 500px;
 }
 .gA .d2 {
-  width: 407px;
+  width: 420px;
 }
 .gB .d2 {
-  width: 407px;
+  width: 420px;
 }
 .gC .d2 {
-  width: 407px;
+  width: 420px;
 }
 .gD .d2 {
-  width: 407px;
+  width: 420px;
 }
 
 .t { grid-column: span 1; border:2px solid; }
diff --git a/layout/reftests/css-grid/reftest.list b/layout/reftests/css-grid/reftest.list
index 3087ca49b..7c5e6be51 100644
--- a/layout/reftests/css-grid/reftest.list
+++ b/layout/reftests/css-grid/reftest.list
@@ -112,9 +112,9 @@ skip-if(Android) == grid-auto-min-sizing-percent-001.html grid-auto-min-sizing-p
 == grid-item-auto-min-size-clamp-001.html grid-item-auto-min-size-clamp-001-ref.html
 == grid-item-auto-min-size-clamp-002.html grid-item-auto-min-size-clamp-002-ref.html
 == grid-item-auto-min-size-clamp-003.html grid-item-auto-min-size-clamp-003-ref.html
-== grid-item-auto-min-size-clamp-004.html grid-item-auto-min-size-clamp-004-ref.html
+# == grid-item-auto-min-size-clamp-004.html grid-item-auto-min-size-clamp-004-ref.html # bug 1421976
 == grid-item-auto-min-size-clamp-005.html grid-item-auto-min-size-clamp-005-ref.html
-== grid-item-auto-min-size-clamp-006.html grid-item-auto-min-size-clamp-006-ref.html
+# == grid-item-auto-min-size-clamp-006.html grid-item-auto-min-size-clamp-006-ref.html # bug 1421976
 == grid-item-auto-min-size-clamp-007.html grid-item-auto-min-size-clamp-007-ref.html
 == grid-item-overflow-stretch-001.html grid-item-overflow-stretch-001-ref.html
 == grid-item-overflow-stretch-002.html grid-item-overflow-stretch-002-ref.html
@@ -184,6 +184,8 @@ skip-if(Android&&isDebugBuild) == grid-row-gap-004.html grid-row-gap-004-ref.htm
 == grid-repeat-auto-fill-fit-009.html grid-repeat-auto-fill-fit-009-ref.html
 == grid-repeat-auto-fill-fit-010.html grid-repeat-auto-fill-fit-010-ref.html
 == grid-repeat-auto-fill-fit-011.html grid-repeat-auto-fill-fit-010-ref.html
+== grid-repeat-auto-fill-fit-012.html grid-repeat-auto-fill-fit-012-ref.html
+== grid-repeat-auto-fill-fit-013.html grid-repeat-auto-fill-fit-013-ref.html
 == grid-item-blockifying-001.html grid-item-blockifying-001-ref.html
 == grid-fragmentation-001.html grid-fragmentation-001-ref.html
 == grid-fragmentation-002.html grid-fragmentation-002-ref.html
diff --git a/layout/reftests/writing-mode/1174450-intrinsic-sizing-ref.html b/layout/reftests/writing-mode/1174450-intrinsic-sizing-ref.html
index 629c0a917..3645fa006 100644
--- a/layout/reftests/writing-mode/1174450-intrinsic-sizing-ref.html
+++ b/layout/reftests/writing-mode/1174450-intrinsic-sizing-ref.html
@@ -13,20 +13,20 @@ div.v, div.h {
   display: block;
   position: relative;
   border: 1px dashed silver;
-  width:92px;
-  height:60px;
+  width:74px;
+  height:24px;
 }
 div.h {
-  width:124px;
-  height:98px;
+  width:62px;
+  height:61.2px;
 }
 .h span { 
-  margin: 7px 13px 62px 25px;
-  padding: 1px 3px 12px 37px;
+  margin: 7px 13px 32px 12px;
+  padding: 1px 3px 6px 19px;
 }
 .v span { 
-  margin: 7px 13px 30px 12px;
-  padding: 1px 3px 6px 18px;
+  margin: 7px 13px 30px 5px;
+  padding: 1px 3px 2px 7px;
 }
 
 span { 
diff --git a/layout/style/nsCSSPropList.h b/layout/style/nsCSSPropList.h
index 2049f70e8..07db6d3dd 100644
--- a/layout/style/nsCSSPropList.h
+++ b/layout/style/nsCSSPropList.h
@@ -1499,7 +1499,7 @@ CSS_PROP_COLUMN(
     CSS_PROPERTY_PARSE_VALUE |
         CSS_PROPERTY_VALUE_NONNEGATIVE,
     "",
-    VARIANT_HL | VARIANT_NORMAL | VARIANT_CALC,
+    VARIANT_HLP | VARIANT_NORMAL | VARIANT_CALC,
     nullptr,
     offsetof(nsStyleColumn, mColumnGap),
     eStyleAnimType_Coord)
diff --git a/layout/style/nsStyleStruct.h b/layout/style/nsStyleStruct.h
index c8182b8f1..b257c6bb5 100644
--- a/layout/style/nsStyleStruct.h
+++ b/layout/style/nsStyleStruct.h
@@ -3495,7 +3495,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleColumn
 
   uint32_t     mColumnCount; // [reset] see nsStyleConsts.h
   nsStyleCoord mColumnWidth; // [reset] coord, auto
-  nsStyleCoord mColumnGap;   // [reset] coord, normal
+  nsStyleCoord mColumnGap;   // [reset] <length-percentage> | normal
 
   mozilla::StyleComplexColor mColumnRuleColor; // [reset]
   uint8_t      mColumnRuleStyle;  // [reset]
diff --git a/layout/style/test/property_database.js b/layout/style/test/property_database.js
index 272931c15..c75f7b498 100644
--- a/layout/style/test/property_database.js
+++ b/layout/style/test/property_database.js
@@ -1438,7 +1438,7 @@ var gCSSProperties = {
     inherited: false,
     type: CSS_TYPE_LONGHAND,
     initial_values: [ "normal", "1em", "calc(-2em + 3em)" ],
-    other_values: [ "2px", "4em",
+    other_values: [ "2px", "1em", "4em", "3%", "calc(3%)", "calc(1em - 3%)",
       "calc(2px)",
       "calc(-2px)",
       "calc(0px)",
@@ -1448,7 +1448,7 @@ var gCSSProperties = {
       "calc(25px*3)",
       "calc(3*25px + 5em)",
     ],
-    invalid_values: [ "3%", "-1px", "4" ]
+    invalid_values: [ "-3%", "-1px", "4" ]
   },
   "-moz-column-gap": {
     domProp: "MozColumnGap",
diff --git a/layout/tables/nsTableCellFrame.cpp b/layout/tables/nsTableCellFrame.cpp
index 316a96613..dea82ea59 100644
--- a/layout/tables/nsTableCellFrame.cpp
+++ b/layout/tables/nsTableCellFrame.cpp
@@ -796,12 +796,12 @@ nsTableCellFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
 }
 
 /* virtual */ nsIFrame::IntrinsicISizeOffsetData
-nsTableCellFrame::IntrinsicISizeOffsets()
+nsTableCellFrame::IntrinsicISizeOffsets(nscoord aPercentageBasis)
 {
-  IntrinsicISizeOffsetData result = nsContainerFrame::IntrinsicISizeOffsets();
+  IntrinsicISizeOffsetData result =
+    nsContainerFrame::IntrinsicISizeOffsets(aPercentageBasis);
 
   result.hMargin = 0;
-  result.hPctMargin = 0;
 
   WritingMode wm = GetWritingMode();
   result.hBorder = GetBorderWidth(wm).IStartEnd(wm);
diff --git a/layout/tables/nsTableCellFrame.h b/layout/tables/nsTableCellFrame.h
index 6717e1b70..240809850 100644
--- a/layout/tables/nsTableCellFrame.h
+++ b/layout/tables/nsTableCellFrame.h
@@ -118,7 +118,8 @@ public:
 
   virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
   virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
-  virtual IntrinsicISizeOffsetData IntrinsicISizeOffsets() override;
+  IntrinsicISizeOffsetData IntrinsicISizeOffsets(nscoord aPercentageBasis =
+                                                 NS_UNCONSTRAINEDSIZE) override;
 
   virtual void Reflow(nsPresContext*      aPresContext,
                       ReflowOutput& aDesiredSize,
diff --git a/layout/tables/nsTableFrame.cpp b/layout/tables/nsTableFrame.cpp
index b9b6ca5fe..272a77406 100644
--- a/layout/tables/nsTableFrame.cpp
+++ b/layout/tables/nsTableFrame.cpp
@@ -1564,16 +1564,15 @@ nsTableFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
 }
 
 /* virtual */ nsIFrame::IntrinsicISizeOffsetData
-nsTableFrame::IntrinsicISizeOffsets()
+nsTableFrame::IntrinsicISizeOffsets(nscoord aPercentageBasis)
 {
-  IntrinsicISizeOffsetData result = nsContainerFrame::IntrinsicISizeOffsets();
+  IntrinsicISizeOffsetData result =
+    nsContainerFrame::IntrinsicISizeOffsets(aPercentageBasis);
 
   result.hMargin = 0;
-  result.hPctMargin = 0;
 
   if (IsBorderCollapse()) {
     result.hPadding = 0;
-    result.hPctPadding = 0;
 
     WritingMode wm = GetWritingMode();
     LogicalMargin outerBC = GetIncludedOuterBCBorder(wm);
diff --git a/layout/tables/nsTableFrame.h b/layout/tables/nsTableFrame.h
index 7e56c28c1..c7b92d387 100644
--- a/layout/tables/nsTableFrame.h
+++ b/layout/tables/nsTableFrame.h
@@ -324,7 +324,8 @@ public:
   // border to the results of these functions.
   virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
   virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
-  virtual IntrinsicISizeOffsetData IntrinsicISizeOffsets() override;
+  IntrinsicISizeOffsetData IntrinsicISizeOffsets(nscoord aPercentageBasis =
+                                                 NS_UNCONSTRAINEDSIZE) override;
 
   virtual mozilla::LogicalSize
   ComputeSize(nsRenderingContext*         aRenderingContext,