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diff --git a/layout/style/nsCSSPropLogicalGroupList.h b/layout/style/nsCSSPropLogicalGroupList.h
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+/* 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/. */
+
+/*
+ * a list of groups of logical properties, for preprocessing
+ */
+
+// A logical property group is one that defines the corresponding physical
+// longhand properties that could be set by a given set of logical longhand
+// properties.  For example, the logical property group for margin-block-start
+// (and the other three logical margin properties) is one that contains
+// margin-top, margin-right, margin-bottom and margin-left.
+//
+// Logical property groups are defined below using one of the following
+// macros, where the name_ argument must be capitalized LikeThis and
+// must not collide with the name of a property's DOM method (its
+// method_ in nsCSSPropList.h):
+//
+//   CSS_PROP_LOGICAL_GROUP_SHORTHAND(name_)
+//     Defines a logical property group whose corresponding physical
+//     properties are those in a given shorthand.  For example, the
+//     logical property group for margin-{block,inline}-{start,end}
+//     is defined by the margin shorthand.  The name_ argument must
+//     be the method_ name of the shorthand (so Margin rather than
+//     margin).
+//
+//   CSS_PROP_LOGICAL_GROUP_BOX(name_)
+//     Defines a logical property group whose corresponding physical
+//     properties are a set of four box properties which are not
+//     already represented by an existing shorthand property.  For
+//     example, the logical property group for
+//     offset-{block,inline}-{start,end} contains the top, right,
+//     bottom and left physical properties, but there is no shorthand
+//     that sets those four properties.  A table must be defined in
+//     nsCSSProps.cpp named g<name_>LogicalGroupTable containing the
+//     four physical properties in top/right/bottom/left order.
+//
+//   CSS_PROP_LOGICAL_GROUP_AXIS(name_)
+//     Defines a logical property group whose corresponding physical
+//     properties are a set of two axis-related properties.  For
+//     example, the logical property group for {block,inline}-size
+//     contains the width and height properties.  A table must be
+//     defined in nCSSProps.cpp named g<name_>LogicalGroupTable
+//     containing the two physical properties in vertical/horizontal
+//     order, followed by an nsCSSProperty_UNKNOWN entry.
+
+CSS_PROP_LOGICAL_GROUP_SHORTHAND(BorderColor)
+CSS_PROP_LOGICAL_GROUP_SHORTHAND(BorderStyle)
+CSS_PROP_LOGICAL_GROUP_SHORTHAND(BorderWidth)
+CSS_PROP_LOGICAL_GROUP_SHORTHAND(Margin)
+CSS_PROP_LOGICAL_GROUP_AXIS(MaxSize)
+CSS_PROP_LOGICAL_GROUP_BOX(Offset)
+CSS_PROP_LOGICAL_GROUP_SHORTHAND(Padding)
+CSS_PROP_LOGICAL_GROUP_AXIS(MinSize)
+CSS_PROP_LOGICAL_GROUP_AXIS(Size)