Add m-esr52 at 52.6.0

1 files changed, 1124 insertions, 0 deletions

diff --git a/dom/mathml/nsMathMLElement.cpp b/dom/mathml/nsMathMLElement.cpp
new file mode 100644
index 000000000..d6aef876c
--- /dev/null
+++ b/dom/mathml/nsMathMLElement.cpp
@@ -0,0 +1,1124 @@
+/* -*- 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/. */
+
+
+#include "nsMathMLElement.h"
+#include "base/compiler_specific.h"
+#include "mozilla/ArrayUtils.h"
+#include "nsGkAtoms.h"
+#include "nsCRT.h"
+#include "nsLayoutStylesheetCache.h"
+#include "nsRuleData.h"
+#include "nsCSSValue.h"
+#include "nsCSSParser.h"
+#include "nsMappedAttributes.h"
+#include "nsStyleConsts.h"
+#include "nsIDocument.h"
+#include "nsIPresShell.h"
+#include "nsPresContext.h"
+#include "mozAutoDocUpdate.h"
+#include "nsIScriptError.h"
+#include "nsContentUtils.h"
+#include "nsIURI.h"
+
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/dom/ElementBinding.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+//----------------------------------------------------------------------
+// nsISupports methods:
+
+NS_IMPL_ISUPPORTS_INHERITED(nsMathMLElement, nsMathMLElementBase,
+                            nsIDOMElement, nsIDOMNode, Link)
+
+static nsresult
+WarnDeprecated(const char16_t* aDeprecatedAttribute, 
+               const char16_t* aFavoredAttribute, nsIDocument* aDocument)
+{
+  const char16_t *argv[] = 
+    { aDeprecatedAttribute, aFavoredAttribute };
+  return nsContentUtils::
+          ReportToConsole(nsIScriptError::warningFlag,
+                          NS_LITERAL_CSTRING("MathML"), aDocument,
+                          nsContentUtils::eMATHML_PROPERTIES,
+                          "DeprecatedSupersededBy", argv, 2);
+}
+
+static nsresult 
+ReportLengthParseError(const nsString& aValue, nsIDocument* aDocument)
+{
+  const char16_t *arg = aValue.get();
+  return nsContentUtils::
+         ReportToConsole(nsIScriptError::errorFlag,
+                         NS_LITERAL_CSTRING("MathML"), aDocument,
+                         nsContentUtils::eMATHML_PROPERTIES,
+                         "LengthParsingError", &arg, 1);
+}
+
+static nsresult
+ReportParseErrorNoTag(const nsString& aValue, 
+                      nsIAtom*        aAtom,
+                      nsIDocument*    aDocument)
+{
+  const char16_t *argv[] = 
+    { aValue.get(), aAtom->GetUTF16String() };
+  return nsContentUtils::
+         ReportToConsole(nsIScriptError::errorFlag,
+                         NS_LITERAL_CSTRING("MathML"), aDocument,
+                         nsContentUtils::eMATHML_PROPERTIES,
+                         "AttributeParsingErrorNoTag", argv, 2);
+}
+
+nsMathMLElement::nsMathMLElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
+: nsMathMLElementBase(aNodeInfo),
+  ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
+  mIncrementScriptLevel(false)
+{
+}
+
+nsMathMLElement::nsMathMLElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
+: nsMathMLElementBase(aNodeInfo),
+  ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
+  mIncrementScriptLevel(false)
+{
+}
+
+nsresult
+nsMathMLElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
+                            nsIContent* aBindingParent,
+                            bool aCompileEventHandlers)
+{
+  Link::ResetLinkState(false, Link::ElementHasHref());
+
+  nsresult rv = nsMathMLElementBase::BindToTree(aDocument, aParent,
+                                                aBindingParent,
+                                                aCompileEventHandlers);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (aDocument) {
+    aDocument->RegisterPendingLinkUpdate(this);
+  }
+
+  nsIDocument* doc = GetComposedDoc();
+  if (doc) {
+    if (!doc->GetMathMLEnabled()) {
+      // Enable MathML and setup the style sheet during binding, not element
+      // construction, because we could move a MathML element from the document
+      // that created it to another document.
+      auto cache = nsLayoutStylesheetCache::For(doc->GetStyleBackendType());
+      doc->SetMathMLEnabled();
+      doc->EnsureOnDemandBuiltInUASheet(cache->MathMLSheet());
+
+      // Rebuild style data for the presshell, because style system
+      // optimizations may have taken place assuming MathML was disabled.
+      // (See nsRuleNode::CheckSpecifiedProperties.)
+      nsCOMPtr<nsIPresShell> shell = doc->GetShell();
+      if (shell) {
+        shell->GetPresContext()->
+          PostRebuildAllStyleDataEvent(nsChangeHint(0), eRestyle_Subtree);
+      }
+    }
+  }
+
+  return rv;
+}
+
+void
+nsMathMLElement::UnbindFromTree(bool aDeep, bool aNullParent)
+{
+  // If this link is ever reinserted into a document, it might
+  // be under a different xml:base, so forget the cached state now.
+  Link::ResetLinkState(false, Link::ElementHasHref());
+  
+  nsIDocument* doc = GetUncomposedDoc();
+  if (doc) {
+    doc->UnregisterPendingLinkUpdate(this);
+  }
+
+  nsMathMLElementBase::UnbindFromTree(aDeep, aNullParent);
+}
+
+bool
+nsMathMLElement::ParseAttribute(int32_t aNamespaceID,
+                                nsIAtom* aAttribute,
+                                const nsAString& aValue,
+                                nsAttrValue& aResult)
+{
+  if (aNamespaceID == kNameSpaceID_None) {
+    if (IsMathMLElement(nsGkAtoms::math) && aAttribute == nsGkAtoms::mode) {
+      WarnDeprecated(nsGkAtoms::mode->GetUTF16String(),
+                     nsGkAtoms::display->GetUTF16String(), OwnerDoc());
+    }
+    if (aAttribute == nsGkAtoms::color) {
+      WarnDeprecated(nsGkAtoms::color->GetUTF16String(),
+                     nsGkAtoms::mathcolor_->GetUTF16String(), OwnerDoc());
+    }
+    if (aAttribute == nsGkAtoms::color ||
+        aAttribute == nsGkAtoms::mathcolor_ ||
+        aAttribute == nsGkAtoms::background ||
+        aAttribute == nsGkAtoms::mathbackground_) {
+      return aResult.ParseColor(aValue);
+    }
+  }
+
+  return nsMathMLElementBase::ParseAttribute(aNamespaceID, aAttribute,
+                                             aValue, aResult);
+}
+
+static Element::MappedAttributeEntry sMtableStyles[] = {
+  { &nsGkAtoms::width },
+  { nullptr }
+};
+
+static Element::MappedAttributeEntry sTokenStyles[] = {
+  { &nsGkAtoms::mathsize_ },
+  { &nsGkAtoms::fontsize_ },
+  { &nsGkAtoms::color },
+  { &nsGkAtoms::fontfamily_ },
+  { &nsGkAtoms::fontstyle_ },
+  { &nsGkAtoms::fontweight_ },
+  { &nsGkAtoms::mathvariant_},
+  { nullptr }
+};
+
+static Element::MappedAttributeEntry sEnvironmentStyles[] = {
+  { &nsGkAtoms::scriptlevel_ },
+  { &nsGkAtoms::scriptminsize_ },
+  { &nsGkAtoms::scriptsizemultiplier_ },
+  { &nsGkAtoms::background },
+  { nullptr }
+};
+
+static Element::MappedAttributeEntry sCommonPresStyles[] = {
+  { &nsGkAtoms::mathcolor_ },
+  { &nsGkAtoms::mathbackground_ },
+  { nullptr }
+};
+
+static Element::MappedAttributeEntry sDirStyles[] = {
+  { &nsGkAtoms::dir },
+  { nullptr }
+};
+
+bool
+nsMathMLElement::IsAttributeMapped(const nsIAtom* aAttribute) const
+{
+  static const MappedAttributeEntry* const mtableMap[] = {
+    sMtableStyles,
+    sCommonPresStyles
+  };
+  static const MappedAttributeEntry* const tokenMap[] = {
+    sTokenStyles,
+    sCommonPresStyles,
+    sDirStyles
+  };
+  static const MappedAttributeEntry* const mstyleMap[] = {
+    sTokenStyles,
+    sEnvironmentStyles,
+    sCommonPresStyles,
+    sDirStyles
+  };
+  static const MappedAttributeEntry* const commonPresMap[] = {
+    sCommonPresStyles
+  };
+  static const MappedAttributeEntry* const mrowMap[] = {
+    sCommonPresStyles,
+    sDirStyles
+  };
+
+  // We don't support mglyph (yet).
+  if (IsAnyOfMathMLElements(nsGkAtoms::ms_, nsGkAtoms::mi_, nsGkAtoms::mn_,
+                            nsGkAtoms::mo_, nsGkAtoms::mtext_,
+                            nsGkAtoms::mspace_))
+    return FindAttributeDependence(aAttribute, tokenMap);
+  if (IsAnyOfMathMLElements(nsGkAtoms::mstyle_, nsGkAtoms::math))
+    return FindAttributeDependence(aAttribute, mstyleMap);
+
+  if (IsMathMLElement(nsGkAtoms::mtable_))
+    return FindAttributeDependence(aAttribute, mtableMap);
+
+  if (IsMathMLElement(nsGkAtoms::mrow_))
+    return FindAttributeDependence(aAttribute, mrowMap);
+
+  if (IsAnyOfMathMLElements(nsGkAtoms::maction_,
+                            nsGkAtoms::maligngroup_,
+                            nsGkAtoms::malignmark_,
+                            nsGkAtoms::menclose_,
+                            nsGkAtoms::merror_,
+                            nsGkAtoms::mfenced_,
+                            nsGkAtoms::mfrac_,
+                            nsGkAtoms::mover_,
+                            nsGkAtoms::mpadded_,
+                            nsGkAtoms::mphantom_,
+                            nsGkAtoms::mprescripts_,
+                            nsGkAtoms::mroot_,
+                            nsGkAtoms::msqrt_,
+                            nsGkAtoms::msub_,
+                            nsGkAtoms::msubsup_,
+                            nsGkAtoms::msup_,
+                            nsGkAtoms::mtd_,
+                            nsGkAtoms::mtr_,
+                            nsGkAtoms::munder_,
+                            nsGkAtoms::munderover_,
+                            nsGkAtoms::none)) {
+    return FindAttributeDependence(aAttribute, commonPresMap);
+  }
+
+  return false;
+}
+
+nsMapRuleToAttributesFunc
+nsMathMLElement::GetAttributeMappingFunction() const
+{
+  // It doesn't really matter what our tag is here, because only attributes
+  // that satisfy IsAttributeMapped will be stored in the mapped attributes
+  // list and available to the mapping function
+  return &MapMathMLAttributesInto;
+}
+
+/* static */ bool
+nsMathMLElement::ParseNamedSpaceValue(const nsString& aString,
+                                      nsCSSValue&     aCSSValue,
+                                      uint32_t        aFlags)
+{
+   int32_t i = 0;
+   // See if it is one of the 'namedspace' (ranging -7/18em, -6/18, ... 7/18em)
+   if (aString.EqualsLiteral("veryverythinmathspace")) {
+     i = 1;
+   } else if (aString.EqualsLiteral("verythinmathspace")) {
+     i = 2;
+   } else if (aString.EqualsLiteral("thinmathspace")) {
+     i = 3;
+   } else if (aString.EqualsLiteral("mediummathspace")) {
+     i = 4;
+   } else if (aString.EqualsLiteral("thickmathspace")) {
+     i = 5;
+   } else if (aString.EqualsLiteral("verythickmathspace")) {
+     i = 6;
+   } else if (aString.EqualsLiteral("veryverythickmathspace")) {
+     i = 7;
+   } else if (aFlags & PARSE_ALLOW_NEGATIVE) {
+     if (aString.EqualsLiteral("negativeveryverythinmathspace")) {
+       i = -1;
+     } else if (aString.EqualsLiteral("negativeverythinmathspace")) {
+       i = -2;
+     } else if (aString.EqualsLiteral("negativethinmathspace")) {
+       i = -3;
+     } else if (aString.EqualsLiteral("negativemediummathspace")) {
+       i = -4;
+     } else if (aString.EqualsLiteral("negativethickmathspace")) {
+       i = -5;
+     } else if (aString.EqualsLiteral("negativeverythickmathspace")) {
+       i = -6;
+     } else if (aString.EqualsLiteral("negativeveryverythickmathspace")) {
+       i = -7;
+     }
+   }
+   if (0 != i) { 
+     aCSSValue.SetFloatValue(float(i)/float(18), eCSSUnit_EM);
+     return true;
+   }
+   
+   return false;
+}
+ 
+// The REC says:
+//
+// "Most presentation elements have attributes that accept values representing
+// lengths to be used for size, spacing or similar properties. The syntax of a
+// length is specified as
+//
+// number | number unit | namedspace
+//
+// There should be no space between the number and the unit of a length."
+// 
+// "A trailing '%' represents a percent of the default value. The default
+// value, or how it is obtained, is listed in the table of attributes for each
+// element. [...] A number without a unit is intepreted as a multiple of the
+// default value."
+//
+// "The possible units in MathML are:
+//  
+// Unit Description
+// em   an em (font-relative unit traditionally used for horizontal lengths)
+// ex   an ex (font-relative unit traditionally used for vertical lengths)
+// px   pixels, or size of a pixel in the current display
+// in   inches (1 inch = 2.54 centimeters)
+// cm   centimeters
+// mm   millimeters
+// pt   points (1 point = 1/72 inch)
+// pc   picas (1 pica = 12 points)
+// %    percentage of default value"
+//
+// The numbers are defined that way:
+// - unsigned-number: "a string of decimal digits with up to one decimal point
+//   (U+002E), representing a non-negative terminating decimal number (a type of
+//   rational number)"
+// - number: "an optional prefix of '-' (U+002D), followed by an unsigned
+//   number, representing a terminating decimal number (a type of rational
+//   number)"
+//
+/* static */ bool
+nsMathMLElement::ParseNumericValue(const nsString& aString,
+                                   nsCSSValue&     aCSSValue,
+                                   uint32_t        aFlags,
+                                   nsIDocument*    aDocument)
+{
+  nsAutoString str(aString);
+  str.CompressWhitespace(); // aString is const in this code...
+
+  int32_t stringLength = str.Length();
+  if (!stringLength) {
+    if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
+      ReportLengthParseError(aString, aDocument);
+    }
+    return false;
+  }
+
+  if (ParseNamedSpaceValue(str, aCSSValue, aFlags)) {
+    return true;
+  }
+
+  nsAutoString number, unit;
+
+  // see if the negative sign is there
+  int32_t i = 0;
+  char16_t c = str[0];
+  if (c == '-') {
+    number.Append(c);
+    i++;
+  }
+
+  // Gather up characters that make up the number
+  bool gotDot = false;
+  for ( ; i < stringLength; i++) {
+    c = str[i];
+    if (gotDot && c == '.') {
+      if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
+        ReportLengthParseError(aString, aDocument);
+      }
+      return false;  // two dots encountered
+    }
+    else if (c == '.')
+      gotDot = true;
+    else if (!nsCRT::IsAsciiDigit(c)) {
+      str.Right(unit, stringLength - i);
+      // some authors leave blanks before the unit, but that shouldn't
+      // be allowed, so don't CompressWhitespace on 'unit'.
+      break;
+    }
+    number.Append(c);
+  }
+
+  // Convert number to floating point
+  nsresult errorCode;
+  float floatValue = number.ToFloat(&errorCode);
+  if (NS_FAILED(errorCode)) {
+    if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
+      ReportLengthParseError(aString, aDocument);
+    }
+    return false;
+  }
+  if (floatValue < 0 && !(aFlags & PARSE_ALLOW_NEGATIVE)) {
+    if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
+      ReportLengthParseError(aString, aDocument);
+    }
+    return false;
+  }
+
+  nsCSSUnit cssUnit;
+  if (unit.IsEmpty()) {
+    if (aFlags & PARSE_ALLOW_UNITLESS) {
+      // no explicit unit, this is a number that will act as a multiplier
+      if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
+        nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                        NS_LITERAL_CSTRING("MathML"), aDocument,
+                                        nsContentUtils::eMATHML_PROPERTIES,
+                                        "UnitlessValuesAreDeprecated");
+      }
+      if (aFlags & CONVERT_UNITLESS_TO_PERCENT) {
+        aCSSValue.SetPercentValue(floatValue);
+        return true;
+      }
+      else
+        cssUnit = eCSSUnit_Number;
+    } else {
+      // We are supposed to have a unit, but there isn't one.
+      // If the value is 0 we can just call it "pixels" otherwise
+      // this is illegal.
+      if (floatValue != 0.0) {
+        if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
+          ReportLengthParseError(aString, aDocument);
+        }
+        return false;
+      }
+      cssUnit = eCSSUnit_Pixel;
+    }
+  }
+  else if (unit.EqualsLiteral("%")) {
+    aCSSValue.SetPercentValue(floatValue / 100.0f);
+    return true;
+  }
+  else if (unit.EqualsLiteral("em")) cssUnit = eCSSUnit_EM;
+  else if (unit.EqualsLiteral("ex")) cssUnit = eCSSUnit_XHeight;
+  else if (unit.EqualsLiteral("px")) cssUnit = eCSSUnit_Pixel;
+  else if (unit.EqualsLiteral("in")) cssUnit = eCSSUnit_Inch;
+  else if (unit.EqualsLiteral("cm")) cssUnit = eCSSUnit_Centimeter;
+  else if (unit.EqualsLiteral("mm")) cssUnit = eCSSUnit_Millimeter;
+  else if (unit.EqualsLiteral("pt")) cssUnit = eCSSUnit_Point;
+  else if (unit.EqualsLiteral("pc")) cssUnit = eCSSUnit_Pica;
+  else if (unit.EqualsLiteral("q")) cssUnit = eCSSUnit_Quarter;
+  else { // unexpected unit
+    if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
+      ReportLengthParseError(aString, aDocument);
+    }
+    return false;
+  }
+
+  aCSSValue.SetFloatValue(floatValue, cssUnit);
+  return true;
+}
+
+void
+nsMathMLElement::MapMathMLAttributesInto(const nsMappedAttributes* aAttributes,
+                                         nsRuleData* aData)
+{
+  if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Font)) {
+    // scriptsizemultiplier
+    //
+    // "Specifies the multiplier to be used to adjust font size due to changes
+    // in scriptlevel.
+    //
+    // values: number
+    // default: 0.71
+    //
+    const nsAttrValue* value =
+      aAttributes->GetAttr(nsGkAtoms::scriptsizemultiplier_);
+    nsCSSValue* scriptSizeMultiplier =
+      aData->ValueForScriptSizeMultiplier();
+    if (value && value->Type() == nsAttrValue::eString &&
+        scriptSizeMultiplier->GetUnit() == eCSSUnit_Null) {
+      nsAutoString str(value->GetStringValue());
+      str.CompressWhitespace();
+      // MathML numbers can't have leading '+'
+      if (str.Length() > 0 && str.CharAt(0) != '+') {
+        nsresult errorCode;
+        float floatValue = str.ToFloat(&errorCode);
+        // Negative scriptsizemultipliers are not parsed
+        if (NS_SUCCEEDED(errorCode) && floatValue >= 0.0f) {
+          scriptSizeMultiplier->SetFloatValue(floatValue, eCSSUnit_Number);
+        } else {
+          ReportParseErrorNoTag(str,
+                                nsGkAtoms::scriptsizemultiplier_,
+                                aData->mPresContext->Document());
+        }
+      }
+    }
+
+    // scriptminsize
+    //
+    // "Specifies the minimum font size allowed due to changes in scriptlevel.
+    // Note that this does not limit the font size due to changes to mathsize."
+    //
+    // values: length
+    // default: 8pt
+    //
+    // We don't allow negative values.
+    // Unitless and percent values give a multiple of the default value.
+    //
+    value = aAttributes->GetAttr(nsGkAtoms::scriptminsize_);
+    nsCSSValue* scriptMinSize = aData->ValueForScriptMinSize();
+    if (value && value->Type() == nsAttrValue::eString &&
+        scriptMinSize->GetUnit() == eCSSUnit_Null) {
+      ParseNumericValue(value->GetStringValue(), *scriptMinSize,
+                        PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT,
+                        aData->mPresContext->Document());
+
+      if (scriptMinSize->GetUnit() == eCSSUnit_Percent) {
+        scriptMinSize->SetFloatValue(8.0 * scriptMinSize->GetPercentValue(),
+                                     eCSSUnit_Point);
+      }
+    }
+
+    // scriptlevel
+    // 
+    // "Changes the scriptlevel in effect for the children. When the value is
+    // given without a sign, it sets scriptlevel to the specified value; when a
+    // sign is given, it increments ("+") or decrements ("-") the current
+    // value. (Note that large decrements can result in negative values of
+    // scriptlevel, but these values are considered legal.)"
+    //
+    // values: ( "+" | "-" )? unsigned-integer
+    // default: inherited
+    //
+    value = aAttributes->GetAttr(nsGkAtoms::scriptlevel_);
+    nsCSSValue* scriptLevel = aData->ValueForScriptLevel();
+    if (value && value->Type() == nsAttrValue::eString &&
+        scriptLevel->GetUnit() == eCSSUnit_Null) {
+      nsAutoString str(value->GetStringValue());
+      str.CompressWhitespace();
+      if (str.Length() > 0) {
+        nsresult errorCode;
+        int32_t intValue = str.ToInteger(&errorCode);
+        if (NS_SUCCEEDED(errorCode)) {
+          // This is kind of cheesy ... if the scriptlevel has a sign,
+          // then it's a relative value and we store the nsCSSValue as an
+          // Integer to indicate that. Otherwise we store it as a Number
+          // to indicate that the scriptlevel is absolute.
+          char16_t ch = str.CharAt(0);
+          if (ch == '+' || ch == '-') {
+            scriptLevel->SetIntValue(intValue, eCSSUnit_Integer);
+          } else {
+            scriptLevel->SetFloatValue(intValue, eCSSUnit_Number);
+          }
+        } else {
+          ReportParseErrorNoTag(str,
+                                nsGkAtoms::scriptlevel_,
+                                aData->mPresContext->Document());
+        }
+      }
+    }
+
+    // mathsize
+    //
+    // "Specifies the size to display the token content. The values 'small' and
+    // 'big' choose a size smaller or larger than the current font size, but
+    // leave the exact proportions unspecified; 'normal' is allowed for
+    // completeness, but since it is equivalent to '100%' or '1em', it has no
+    // effect."
+    //
+    // values: "small" | "normal" | "big" | length
+    // default: inherited
+    //
+    // fontsize
+    //
+    // "Specified the size for the token. Deprecated in favor of mathsize."
+    //
+    // values: length
+    // default: inherited
+    //
+    // In both cases, we don't allow negative values.
+    // Unitless values give a multiple of the default value.
+    //  
+    bool parseSizeKeywords = true;
+    value = aAttributes->GetAttr(nsGkAtoms::mathsize_);
+    if (!value) {
+      parseSizeKeywords = false;
+      value = aAttributes->GetAttr(nsGkAtoms::fontsize_);
+      if (value) {
+        WarnDeprecated(nsGkAtoms::fontsize_->GetUTF16String(),
+                       nsGkAtoms::mathsize_->GetUTF16String(),
+                       aData->mPresContext->Document());
+      }
+    }
+    nsCSSValue* fontSize = aData->ValueForFontSize();
+    if (value && value->Type() == nsAttrValue::eString &&
+        fontSize->GetUnit() == eCSSUnit_Null) {
+      nsAutoString str(value->GetStringValue());
+      if (!ParseNumericValue(str, *fontSize, PARSE_SUPPRESS_WARNINGS |
+                             PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT,
+                             nullptr)
+          && parseSizeKeywords) {
+        static const char sizes[3][7] = { "small", "normal", "big" };
+        static const int32_t values[MOZ_ARRAY_LENGTH(sizes)] = {
+          NS_STYLE_FONT_SIZE_SMALL, NS_STYLE_FONT_SIZE_MEDIUM,
+          NS_STYLE_FONT_SIZE_LARGE
+        };
+        str.CompressWhitespace();
+        for (uint32_t i = 0; i < ArrayLength(sizes); ++i) {
+          if (str.EqualsASCII(sizes[i])) {
+            fontSize->SetIntValue(values[i], eCSSUnit_Enumerated);
+            break;
+          }
+        }
+      }
+    }
+
+    // fontfamily
+    //
+    // "Should be the name of a font that may be available to a MathML renderer,
+    // or a CSS font specification; See Section 6.5 Using CSS with MathML and
+    // CSS for more information. Deprecated in favor of mathvariant."
+    //
+    // values: string
+    // 
+    value = aAttributes->GetAttr(nsGkAtoms::fontfamily_);
+    nsCSSValue* fontFamily = aData->ValueForFontFamily();
+    if (value) {
+      WarnDeprecated(nsGkAtoms::fontfamily_->GetUTF16String(),
+                     nsGkAtoms::mathvariant_->GetUTF16String(),
+                     aData->mPresContext->Document());
+    }
+    if (value && value->Type() == nsAttrValue::eString &&
+        fontFamily->GetUnit() == eCSSUnit_Null) {
+      nsCSSParser parser;
+      parser.ParseFontFamilyListString(value->GetStringValue(),
+                                       nullptr, 0, *fontFamily);
+    }
+
+    // fontstyle
+    //
+    // "Specified the font style to use for the token. Deprecated in favor of
+    //  mathvariant."
+    //
+    // values: "normal" | "italic"
+    // default:	normal (except on <mi>)
+    //
+    // Note that the font-style property is reset in layout/style/ when
+    // -moz-math-variant is specified.
+    nsCSSValue* fontStyle = aData->ValueForFontStyle();
+    value = aAttributes->GetAttr(nsGkAtoms::fontstyle_);
+    if (value) {
+      WarnDeprecated(nsGkAtoms::fontstyle_->GetUTF16String(),
+                       nsGkAtoms::mathvariant_->GetUTF16String(),
+                       aData->mPresContext->Document());
+      if (value->Type() == nsAttrValue::eString &&
+          fontStyle->GetUnit() == eCSSUnit_Null) {
+        nsAutoString str(value->GetStringValue());
+        str.CompressWhitespace();
+        if (str.EqualsASCII("normal")) {
+          fontStyle->SetIntValue(NS_STYLE_FONT_STYLE_NORMAL,
+                                eCSSUnit_Enumerated);
+        } else if (str.EqualsASCII("italic")) {
+          fontStyle->SetIntValue(NS_STYLE_FONT_STYLE_ITALIC,
+                                eCSSUnit_Enumerated);
+        }
+      }
+    }
+
+    // fontweight
+    //
+    // "Specified the font weight for the token. Deprecated in favor of
+    // mathvariant."
+    //
+    // values: "normal" | "bold"
+    // default: normal
+    //
+    // Note that the font-weight property is reset in layout/style/ when
+    // -moz-math-variant is specified.
+    nsCSSValue* fontWeight = aData->ValueForFontWeight();
+    value = aAttributes->GetAttr(nsGkAtoms::fontweight_);
+    if (value) {
+      WarnDeprecated(nsGkAtoms::fontweight_->GetUTF16String(),
+                       nsGkAtoms::mathvariant_->GetUTF16String(),
+                       aData->mPresContext->Document());
+      if (value->Type() == nsAttrValue::eString &&
+          fontWeight->GetUnit() == eCSSUnit_Null) {
+        nsAutoString str(value->GetStringValue());
+        str.CompressWhitespace();
+        if (str.EqualsASCII("normal")) {
+          fontWeight->SetIntValue(NS_STYLE_FONT_WEIGHT_NORMAL,
+                                 eCSSUnit_Enumerated);
+        } else if (str.EqualsASCII("bold")) {
+          fontWeight->SetIntValue(NS_STYLE_FONT_WEIGHT_BOLD,
+                                  eCSSUnit_Enumerated);
+        }
+      }
+    }
+
+    // mathvariant
+    //
+    // "Specifies the logical class of the token. Note that this class is more
+    // than styling, it typically conveys semantic intent;"
+    //
+    // values: "normal" | "bold" | "italic" | "bold-italic" | "double-struck" |
+    // "bold-fraktur" | "script" | "bold-script" | "fraktur" | "sans-serif" |
+    // "bold-sans-serif" | "sans-serif-italic" | "sans-serif-bold-italic" |
+    // "monospace" | "initial" | "tailed" | "looped" | "stretched"
+    // default: normal (except on <mi>)
+    //
+    nsCSSValue* mathVariant = aData->ValueForMathVariant();
+    value = aAttributes->GetAttr(nsGkAtoms::mathvariant_);
+    if (value && value->Type() == nsAttrValue::eString &&
+        mathVariant->GetUnit() == eCSSUnit_Null) {
+      nsAutoString str(value->GetStringValue());
+      str.CompressWhitespace();
+      static const char sizes[19][23] = {
+        "normal", "bold", "italic", "bold-italic", "script", "bold-script",
+        "fraktur", "double-struck", "bold-fraktur", "sans-serif",
+        "bold-sans-serif", "sans-serif-italic", "sans-serif-bold-italic",
+        "monospace", "initial", "tailed", "looped", "stretched"
+      };
+      static const int32_t values[MOZ_ARRAY_LENGTH(sizes)] = {
+        NS_MATHML_MATHVARIANT_NORMAL, NS_MATHML_MATHVARIANT_BOLD,
+        NS_MATHML_MATHVARIANT_ITALIC, NS_MATHML_MATHVARIANT_BOLD_ITALIC,
+        NS_MATHML_MATHVARIANT_SCRIPT, NS_MATHML_MATHVARIANT_BOLD_SCRIPT,
+        NS_MATHML_MATHVARIANT_FRAKTUR, NS_MATHML_MATHVARIANT_DOUBLE_STRUCK,
+        NS_MATHML_MATHVARIANT_BOLD_FRAKTUR, NS_MATHML_MATHVARIANT_SANS_SERIF,
+        NS_MATHML_MATHVARIANT_BOLD_SANS_SERIF,
+        NS_MATHML_MATHVARIANT_SANS_SERIF_ITALIC,
+        NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC,
+        NS_MATHML_MATHVARIANT_MONOSPACE, NS_MATHML_MATHVARIANT_INITIAL,
+        NS_MATHML_MATHVARIANT_TAILED, NS_MATHML_MATHVARIANT_LOOPED,
+        NS_MATHML_MATHVARIANT_STRETCHED
+      };
+      for (uint32_t i = 0; i < ArrayLength(sizes); ++i) {
+        if (str.EqualsASCII(sizes[i])) {
+          mathVariant->SetIntValue(values[i], eCSSUnit_Enumerated);
+          break;
+        }
+      }
+    }
+  }
+
+  // mathbackground
+  // 
+  // "Specifies the background color to be used to fill in the bounding box of
+  // the element and its children. The default, 'transparent', lets the
+  // background color, if any, used in the current rendering context to show
+  // through."
+  // 
+  // values: color | "transparent" 
+  // default: "transparent"
+  //
+  // background
+  //
+  // "Specified the background color to be used to fill in the bounding box of
+  // the element and its children. Deprecated in favor of mathbackground."
+  //
+  // values: color | "transparent"
+  // default: "transparent"
+  //
+  if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Background)) {
+    const nsAttrValue* value =
+      aAttributes->GetAttr(nsGkAtoms::mathbackground_);
+    if (!value) {
+      value = aAttributes->GetAttr(nsGkAtoms::background);
+      if (value) {
+        WarnDeprecated(nsGkAtoms::background->GetUTF16String(),
+                       nsGkAtoms::mathbackground_->GetUTF16String(),
+                       aData->mPresContext->Document());
+      }
+    }
+    nsCSSValue* backgroundColor = aData->ValueForBackgroundColor();
+    if (value && backgroundColor->GetUnit() == eCSSUnit_Null) {
+      nscolor color;
+      if (value->GetColorValue(color)) {
+        backgroundColor->SetColorValue(color);
+      }
+    }
+  }
+
+  // mathcolor
+  //
+  // "Specifies the foreground color to use when drawing the components of this
+  // element, such as the content for token elements or any lines, surds, or
+  // other decorations. It also establishes the default mathcolor used for
+  // child elements when used on a layout element."
+  //
+  // values: color
+  // default: inherited
+  //
+  // color
+  // 
+  // "Specified the color for the token. Deprecated in favor of mathcolor." 
+  //
+  // values: color
+  // default: inherited
+  //
+  if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Color)) {
+    const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::mathcolor_);
+    if (!value) {
+      value = aAttributes->GetAttr(nsGkAtoms::color);
+      if (value) {
+        WarnDeprecated(nsGkAtoms::color->GetUTF16String(),
+                       nsGkAtoms::mathcolor_->GetUTF16String(),
+                       aData->mPresContext->Document());
+      }
+    }
+    nscolor color;
+    nsCSSValue* colorValue = aData->ValueForColor();
+    if (value && value->GetColorValue(color) &&
+        colorValue->GetUnit() == eCSSUnit_Null) {
+      colorValue->SetColorValue(color);
+    }
+  }
+
+  if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Position)) {
+    // width
+    //
+    // "Specifies the desired width of the entire table and is intended for
+    // visual user agents. When the value is a percentage value, the value is
+    // relative to the horizontal space a MathML renderer has available for the
+    // math element. When the value is "auto", the MathML renderer should
+    // calculate the table width from its contents using whatever layout
+    // algorithm it chooses. "
+    //
+    // values: "auto" | length
+    // default: auto
+    //
+    nsCSSValue* width = aData->ValueForWidth();
+    if (width->GetUnit() == eCSSUnit_Null) {
+      const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::width);
+      // This does not handle auto and unitless values
+      if (value && value->Type() == nsAttrValue::eString) {
+        ParseNumericValue(value->GetStringValue(), *width, 0,
+                          aData->mPresContext->Document());
+      }
+    }
+  }
+
+  // dir
+  //
+  // Overall Directionality of Mathematics Formulas:
+  // "The overall directionality for a formula, basically the direction of the
+  // Layout Schemata, is specified by the dir attribute on the containing math
+  // element (see Section 2.2 The Top-Level math Element). The default is ltr.
+  // [...] The overall directionality is usually set on the math, but may also 
+  // be switched for individual subformula by using the dir attribute on mrow
+  // or mstyle elements." 
+  //
+  // Bidirectional Layout in Token Elements:
+  // "Specifies the initial directionality for text within the token:
+  // ltr (Left To Right) or rtl (Right To Left). This attribute should only be
+  // needed in rare cases involving weak or neutral characters;
+  // see Section 3.1.5.1 Overall Directionality of Mathematics Formulas for
+  // further discussion. It has no effect on mspace."
+  //
+  // values: "ltr" | "rtl"
+  // default: inherited
+  //
+  if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Visibility)) {
+    const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::dir);
+    nsCSSValue* direction = aData->ValueForDirection();
+    if (value && value->Type() == nsAttrValue::eString &&
+        direction->GetUnit() == eCSSUnit_Null) {
+      nsAutoString str(value->GetStringValue());
+      static const char dirs[][4] = { "ltr", "rtl" };
+      static const int32_t dirValues[MOZ_ARRAY_LENGTH(dirs)] = {
+        NS_STYLE_DIRECTION_LTR, NS_STYLE_DIRECTION_RTL
+      };
+      for (uint32_t i = 0; i < ArrayLength(dirs); ++i) {
+        if (str.EqualsASCII(dirs[i])) {
+          direction->SetIntValue(dirValues[i], eCSSUnit_Enumerated);
+          break;
+        }
+      }
+    }
+  }
+}
+
+nsresult
+nsMathMLElement::PreHandleEvent(EventChainPreVisitor& aVisitor)
+{
+  nsresult rv = Element::PreHandleEvent(aVisitor);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return PreHandleEventForLinks(aVisitor);
+}
+
+nsresult
+nsMathMLElement::PostHandleEvent(EventChainPostVisitor& aVisitor)
+{
+  return PostHandleEventForLinks(aVisitor);
+}
+
+NS_IMPL_ELEMENT_CLONE(nsMathMLElement)
+
+EventStates
+nsMathMLElement::IntrinsicState() const
+{
+  return Link::LinkState() | nsMathMLElementBase::IntrinsicState() |
+    (mIncrementScriptLevel ?
+       NS_EVENT_STATE_INCREMENT_SCRIPT_LEVEL : EventStates());
+}
+
+bool
+nsMathMLElement::IsNodeOfType(uint32_t aFlags) const
+{
+  return !(aFlags & ~eCONTENT);
+}
+
+void
+nsMathMLElement::SetIncrementScriptLevel(bool aIncrementScriptLevel,
+                                         bool aNotify)
+{
+  if (aIncrementScriptLevel == mIncrementScriptLevel)
+    return;
+  mIncrementScriptLevel = aIncrementScriptLevel;
+
+  NS_ASSERTION(aNotify, "We always notify!");
+
+  UpdateState(true);
+}
+
+bool
+nsMathMLElement::IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse)
+{
+  nsCOMPtr<nsIURI> uri;
+  if (IsLink(getter_AddRefs(uri))) {
+    if (aTabIndex) {
+      *aTabIndex = ((sTabFocusModel & eTabFocus_linksMask) == 0 ? -1 : 0);
+    }
+    return true;
+  }
+
+  if (aTabIndex) {
+    *aTabIndex = -1;
+  }
+
+  return false;
+}
+
+bool
+nsMathMLElement::IsLink(nsIURI** aURI) const
+{
+  // http://www.w3.org/TR/2010/REC-MathML3-20101021/chapter6.html#interf.link
+  // The REC says that the following elements should not be linking elements:
+  if (IsAnyOfMathMLElements(nsGkAtoms::mprescripts_, nsGkAtoms::none,
+                            nsGkAtoms::malignmark_, nsGkAtoms::maligngroup_)) {
+    *aURI = nullptr;
+    return false;
+  }
+
+  bool hasHref = false;
+  const nsAttrValue* href = mAttrsAndChildren.GetAttr(nsGkAtoms::href,
+                                                      kNameSpaceID_None);
+  if (href) {
+    // MathML href
+    // The REC says: "When user agents encounter MathML elements with both href
+    // and xlink:href attributes, the href attribute should take precedence."
+    hasHref = true;
+  } else {
+    // To be a clickable XLink for styling and interaction purposes, we require:
+    //
+    //   xlink:href    - must be set
+    //   xlink:type    - must be unset or set to "" or set to "simple"
+    //   xlink:show    - must be unset or set to "", "new" or "replace"
+    //   xlink:actuate - must be unset or set to "" or "onRequest"
+    //
+    // For any other values, we're either not a *clickable* XLink, or the end
+    // result is poorly specified. Either way, we return false.
+    
+    static nsIContent::AttrValuesArray sTypeVals[] =
+      { &nsGkAtoms::_empty, &nsGkAtoms::simple, nullptr };
+    
+    static nsIContent::AttrValuesArray sShowVals[] =
+      { &nsGkAtoms::_empty, &nsGkAtoms::_new, &nsGkAtoms::replace, nullptr };
+    
+    static nsIContent::AttrValuesArray sActuateVals[] =
+      { &nsGkAtoms::_empty, &nsGkAtoms::onRequest, nullptr };
+    
+    // Optimization: check for href first for early return
+    href = mAttrsAndChildren.GetAttr(nsGkAtoms::href,
+                                     kNameSpaceID_XLink);
+    if (href &&
+        FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::type,
+                        sTypeVals, eCaseMatters) !=
+        nsIContent::ATTR_VALUE_NO_MATCH &&
+        FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::show,
+                        sShowVals, eCaseMatters) !=
+        nsIContent::ATTR_VALUE_NO_MATCH &&
+        FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::actuate,
+                        sActuateVals, eCaseMatters) !=
+        nsIContent::ATTR_VALUE_NO_MATCH) {
+      hasHref = true;
+    }
+  }
+
+  if (hasHref) {
+    nsCOMPtr<nsIURI> baseURI = GetBaseURI();
+    // Get absolute URI
+    nsAutoString hrefStr;
+    href->ToString(hrefStr); 
+    nsContentUtils::NewURIWithDocumentCharset(aURI, hrefStr,
+                                              OwnerDoc(), baseURI);
+    // must promise out param is non-null if we return true
+    return !!*aURI;
+  }
+
+  *aURI = nullptr;
+  return false;
+}
+
+void
+nsMathMLElement::GetLinkTarget(nsAString& aTarget)
+{
+  const nsAttrValue* target = mAttrsAndChildren.GetAttr(nsGkAtoms::target,
+                                                        kNameSpaceID_XLink);
+  if (target) {
+    target->ToString(aTarget);
+  }
+
+  if (aTarget.IsEmpty()) {
+
+    static nsIContent::AttrValuesArray sShowVals[] =
+      { &nsGkAtoms::_new, &nsGkAtoms::replace, nullptr };
+    
+    switch (FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::show,
+                            sShowVals, eCaseMatters)) {
+    case 0:
+      aTarget.AssignLiteral("_blank");
+      return;
+    case 1:
+      return;
+    }
+    OwnerDoc()->GetBaseTarget(aTarget);
+  }
+}
+
+already_AddRefed<nsIURI>
+nsMathMLElement::GetHrefURI() const
+{
+  nsCOMPtr<nsIURI> hrefURI;
+  return IsLink(getter_AddRefs(hrefURI)) ? hrefURI.forget() : nullptr;
+}
+
+nsresult
+nsMathMLElement::SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
+                         nsIAtom* aPrefix, const nsAString& aValue,
+                         bool aNotify)
+{
+  nsresult rv = nsMathMLElementBase::SetAttr(aNameSpaceID, aName, aPrefix,
+                                           aValue, aNotify);
+
+  // The ordering of the parent class's SetAttr call and Link::ResetLinkState
+  // is important here!  The attribute is not set until SetAttr returns, and
+  // we will need the updated attribute value because notifying the document
+  // that content states have changed will call IntrinsicState, which will try
+  // to get updated information about the visitedness from Link.
+  if (aName == nsGkAtoms::href &&
+      (aNameSpaceID == kNameSpaceID_None ||
+       aNameSpaceID == kNameSpaceID_XLink)) {
+    if (aNameSpaceID == kNameSpaceID_XLink) {
+      WarnDeprecated(u"xlink:href", u"href", OwnerDoc());
+    }
+    Link::ResetLinkState(!!aNotify, true);
+  }
+
+  return rv;
+}
+
+nsresult
+nsMathMLElement::UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttr,
+                           bool aNotify)
+{
+  nsresult rv = nsMathMLElementBase::UnsetAttr(aNameSpaceID, aAttr, aNotify);
+
+  // The ordering of the parent class's UnsetAttr call and Link::ResetLinkState
+  // is important here!  The attribute is not unset until UnsetAttr returns, and
+  // we will need the updated attribute value because notifying the document
+  // that content states have changed will call IntrinsicState, which will try
+  // to get updated information about the visitedness from Link.
+  if (aAttr == nsGkAtoms::href &&
+      (aNameSpaceID == kNameSpaceID_None ||
+       aNameSpaceID == kNameSpaceID_XLink)) {
+    // Note: just because we removed a single href attr doesn't mean there's no href,
+    // since there are 2 possible namespaces.
+    Link::ResetLinkState(!!aNotify, Link::ElementHasHref());
+  }
+
+  return rv;
+}
+
+JSObject*
+nsMathMLElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return ElementBinding::Wrap(aCx, this, aGivenProto);
+}