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diff --git a/layout/style/nsCSSAnonBoxList.h b/layout/style/nsCSSAnonBoxList.h
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+/* -*- 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/. */
+
+/* atom list for CSS anonymous boxes */
+
+/*
+ * This file contains the list of nsAtoms and their values for CSS
+ * pseudo-element-ish things used internally for anonymous boxes.  It is
+ * designed to be used as inline input to nsCSSAnonBoxes.cpp *only* through the
+ * magic of C preprocessing.  All entries must be enclosed in the macros
+ * CSS_ANON_BOX, CSS_WRAPPER_ANON_BOX, or CSS_NON_INHERITING_ANON_BOX which will
+ * have cruel and unusual things done to it.  The entries should be kept in some
+ * sort of logical order.
+ *
+ * The first argument to
+ * CSS_ANON_BOX/CSS_WRAPPER_ANON_BOX/CSS_NON_INHERITING_ANON_BOX is the C++
+ * identifier of the atom.
+ *
+ * The second argument is the string value of the atom.
+ *
+ * CSS_NON_INHERITING_ANON_BOX is used for anon boxes that never inherit style
+ * from anything.  This means all their property values are the initial values
+ * of those properties.  These ones must come first!  Code relies on this.
+ * If this macro is not defined, it will default to CSS_ANON_BOX.
+ *
+ * CSS_WRAPPER_ANON_BOX is used for anon boxes that are used as wrappers around
+ * other frames during frametree fixup (e.g. table anonymous boxes, ruby
+ * anonymous boxes, anonymous flex item blocks, etc).  These are also inheriting
+ * anon boxes, just like CSS_ANON_BOX.  If this macro is not defined, it will
+ * default to CSS_ANON_BOX.
+ */
+
+// OUTPUT_CLASS=nsCSSAnonBoxes
+// MACRO_NAME=CSS_ANON_BOX/CSS_NON_INHERITING_ANON_BOX/CSS_WRAPPER_ANON_BOX
+
+#ifndef CSS_NON_INHERITING_ANON_BOX
+#  ifdef DEFINED_CSS_NON_INHERITING_ANON_BOX
+#    error "Recursive includes of nsCSSAnonBoxList.h?"
+#  endif /* DEFINED_CSS_NON_INHERITING_ANON_BOX */
+#  define CSS_NON_INHERITING_ANON_BOX(name_, value_) CSS_ANON_BOX(name_, value_)
+#  define DEFINED_CSS_NON_INHERITING_ANON_BOX
+#endif /* CSS_NON_INHERITING_ANON_BOX */
+
+#ifndef CSS_WRAPPER_ANON_BOX
+#  ifdef DEFINED_CSS_WRAPPER_ANON_BOX
+#    error "Recursive includes of nsCSSAnonBoxList.h?"
+#  endif /* DEFINED_CSS_WRAPPER_ANON_BOX */
+#  define CSS_WRAPPER_ANON_BOX(name_, value_) CSS_ANON_BOX(name_, value_)
+#  define DEFINED_CSS_WRAPPER_ANON_BOX
+#endif /* CSS_WRAPPER_ANON_BOX */
+
+//---------------------------------------------------------------------------
+// Non-inheriting ones, which must come first
+//---------------------------------------------------------------------------
+
+// Placeholder frames for out of flows.  Note that :-moz-placeholder is used for
+// the pseudo-element that represents the placeholder text in <input
+// placeholder="foo">, so we need a different string here.
+CSS_NON_INHERITING_ANON_BOX(oofPlaceholder, ":-moz-oof-placeholder")
+
+// Framesets
+CSS_NON_INHERITING_ANON_BOX(horizontalFramesetBorder, ":-moz-hframeset-border")
+CSS_NON_INHERITING_ANON_BOX(verticalFramesetBorder, ":-moz-vframeset-border")
+
+CSS_NON_INHERITING_ANON_BOX(framesetBlank, ":-moz-frameset-blank")
+
+CSS_NON_INHERITING_ANON_BOX(tableColGroup, ":-moz-table-column-group")
+CSS_NON_INHERITING_ANON_BOX(tableCol, ":-moz-table-column")
+
+CSS_NON_INHERITING_ANON_BOX(page, ":-moz-page")
+CSS_NON_INHERITING_ANON_BOX(pageBreak, ":-moz-page-break")
+CSS_NON_INHERITING_ANON_BOX(pageContent, ":-moz-page-content")
+CSS_NON_INHERITING_ANON_BOX(printedSheet, ":-moz-printed-sheet")
+
+// Applies to blocks that wrap contiguous runs of "column-span: all"
+// elements in multi-column subtrees, or the wrappers themselves, all the
+// way up to the column set wrappers.
+CSS_NON_INHERITING_ANON_BOX(columnSpanWrapper, ":-moz-column-span-wrapper")
+
+//---------------------------------------------------------------------------
+// Other ones
+//---------------------------------------------------------------------------
+
+// ::-moz-text, ::-moz-oof-placeholder, and ::-moz-first-letter-continuation are
+// non-elements which no rule will match.
+CSS_ANON_BOX(mozText, ":-moz-text")
+// nsFirstLetterFrames for content outside the ::first-letter.
+CSS_ANON_BOX(firstLetterContinuation, ":-moz-first-letter-continuation")
+
+CSS_ANON_BOX(mozBlockInsideInlineWrapper, ":-moz-block-inside-inline-wrapper")
+CSS_WRAPPER_ANON_BOX(mozMathMLAnonymousBlock, ":-moz-mathml-anonymous-block")
+
+CSS_ANON_BOX(mozLineFrame, ":-moz-line-frame")
+
+CSS_ANON_BOX(buttonContent, ":-moz-button-content")
+CSS_ANON_BOX(cellContent, ":-moz-cell-content")
+CSS_ANON_BOX(dropDownList, ":-moz-dropdown-list")
+CSS_ANON_BOX(fieldsetContent, ":-moz-fieldset-content")
+CSS_ANON_BOX(mozDisplayComboboxControlFrame, ":-moz-display-comboboxcontrol-frame")
+CSS_ANON_BOX(htmlCanvasContent, ":-moz-html-canvas-content")
+
+CSS_WRAPPER_ANON_BOX(inlineTable, ":-moz-inline-table")
+CSS_WRAPPER_ANON_BOX(table, ":-moz-table")
+CSS_WRAPPER_ANON_BOX(tableCell, ":-moz-table-cell")
+CSS_ANON_BOX(tableWrapper, ":-moz-table-wrapper")
+CSS_WRAPPER_ANON_BOX(tableRowGroup, ":-moz-table-row-group")
+CSS_WRAPPER_ANON_BOX(tableRow, ":-moz-table-row")
+
+CSS_ANON_BOX(canvas, ":-moz-canvas")
+CSS_ANON_BOX(pageSequence, ":-moz-page-sequence")
+CSS_ANON_BOX(scrolledContent, ":-moz-scrolled-content")
+CSS_ANON_BOX(scrolledCanvas, ":-moz-scrolled-canvas")
+
+// A column set is a set of columns inside of ColumnSetWrapperFrame, which
+// applies to nsColumnSetFrame. It doesn't contain any column-span elements.
+CSS_ANON_BOX(columnSet, ":-moz-column-set")
+
+// Applies to each column block inside of a column set.
+CSS_ANON_BOX(columnContent, ":-moz-column-content")
+
+CSS_ANON_BOX(viewport, ":-moz-viewport")
+CSS_ANON_BOX(viewportScroll, ":-moz-viewport-scroll")
+
+// Inside a flex/grid/-moz-box container, a contiguous run of text gets wrapped
+// in an anonymous block, which is then treated as a flex item.
+CSS_WRAPPER_ANON_BOX(anonymousItem, ":-moz-anonymous-item")
+
+CSS_ANON_BOX(blockRubyContent, ":-moz-block-ruby-content")
+CSS_WRAPPER_ANON_BOX(ruby, ":-moz-ruby")
+CSS_WRAPPER_ANON_BOX(rubyBase, ":-moz-ruby-base")
+CSS_WRAPPER_ANON_BOX(rubyBaseContainer, ":-moz-ruby-base-container")
+CSS_WRAPPER_ANON_BOX(rubyText, ":-moz-ruby-text")
+CSS_WRAPPER_ANON_BOX(rubyTextContainer, ":-moz-ruby-text-container")
+
+CSS_ANON_BOX(mozTreeColumn, ":-moz-tree-column")
+CSS_ANON_BOX(mozTreeRow, ":-moz-tree-row")
+CSS_ANON_BOX(mozTreeSeparator, ":-moz-tree-separator")
+CSS_ANON_BOX(mozTreeCell, ":-moz-tree-cell")
+CSS_ANON_BOX(mozTreeIndentation, ":-moz-tree-indentation")
+CSS_ANON_BOX(mozTreeLine, ":-moz-tree-line")
+CSS_ANON_BOX(mozTreeTwisty, ":-moz-tree-twisty")
+CSS_ANON_BOX(mozTreeImage, ":-moz-tree-image")
+CSS_ANON_BOX(mozTreeCellText, ":-moz-tree-cell-text")
+CSS_ANON_BOX(mozTreeCheckbox, ":-moz-tree-checkbox")
+CSS_ANON_BOX(mozTreeDropFeedback, ":-moz-tree-drop-feedback")
+
+CSS_ANON_BOX(mozSVGMarkerAnonChild, ":-moz-svg-marker-anon-child")
+CSS_ANON_BOX(mozSVGOuterSVGAnonChild, ":-moz-svg-outer-svg-anon-child")
+CSS_ANON_BOX(mozSVGForeignContent, ":-moz-svg-foreign-content")
+CSS_ANON_BOX(mozSVGText, ":-moz-svg-text")
+
+#ifdef DEFINED_CSS_NON_INHERITING_ANON_BOX
+#  undef DEFINED_CSS_NON_INHERITING_ANON_BOX
+#  undef CSS_NON_INHERITING_ANON_BOX
+#endif /* DEFINED_CSS_NON_INHERITING_ANON_BOX */
+
+#ifdef DEFINED_CSS_WRAPPER_ANON_BOX
+#  undef DEFINED_CSS_WRAPPER_ANON_BOX
+#  undef CSS_WRAPPER_ANON_BOX
+#endif /* DEFINED_CSS_NON_INHERITING_ANON_BOX */