Add support for multiple text decorations with same line positioning

third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
@@ skipping 90 matching lines @@
 // CSS requires text-decoration to be reset at each DOM element for
 // inline blocks, inline tables, shadow DOM crossings, floating elements,
 // and absolute or relatively positioned elements. Outermost <svg> roots are
 // considered to be atomic inline-level.
 static bool doesNotInheritTextDecoration(const ComputedStyle& style,
                                          const Element* element) {
   return style.display() == EDisplay::InlineTable ||
          style.display() == EDisplay::InlineBlock ||
          style.display() == EDisplay::InlineBox ||
          isAtShadowBoundary(element) || style.isFloating() ||
-         style.hasOutOfFlowPosition() || isOutermostSVGElement(element);
+         style.hasOutOfFlowPosition() || isOutermostSVGElement(element) ||
+         isHTMLRTElement(element);
+}
+
+// Certain elements (<a>, <font>) override text decoration colors.  "The font
+// element is expected to override the color of any text decoration that spans
+// the text of the element to the used value of the element's 'color' property."
+// (https://html.spec.whatwg.org/multipage/rendering.html#phrasing-content-3)
+// The <a> behavior is non-standard.
+static bool overridesTextDecorationColors(const Element* element) {
+  return element &&
+         (isHTMLFontElement(element) || isHTMLAnchorElement(element));
 }
 
 // FIXME: This helper is only needed because pseudoStyleForElement passes a null
 // element to adjustComputedStyle, so we can't just use element->isInTopLayer().
 static bool isInTopLayer(const Element* element, const ComputedStyle& style) {
   return (element && element->isInTopLayer()) ||
          style.styleType() == PseudoIdBackdrop;
 }
 
 static bool parentStyleForcesZIndexToCreateStackingContext(
@@ skipping 300 matching lines @@
   }
 
   if (style.overflowX() != OverflowVisible ||
       style.overflowY() != OverflowVisible)
     adjustOverflow(style);
 
   if (doesNotInheritTextDecoration(style, element))
     style.clearAppliedTextDecorations();
   else
     style.restoreParentTextDecorations(parentStyle);
-  style.applyTextDecorations();
+  style.applyTextDecorations(
+      parentStyle.visitedDependentColor(CSSPropertyTextDecorationColor),
+      overridesTextDecorationColors(element));
 
   // Cull out any useless layers and also repeat patterns into additional
   // layers.
   style.adjustBackgroundLayers();
   style.adjustMaskLayers();
 
   // Let the theme also have a crack at adjusting the style.
   if (style.hasAppearance())
     LayoutTheme::theme().adjustStyle(style, element);
 
@@ skipping 19 matching lines @@
       style.setDisplay(EDisplay::Block);
 
     // Columns don't apply to svg text elements.
     if (isSVGTextElement(*element))
       style.clearMultiCol();
   }
   adjustStyleForAlignment(style, parentStyle);
 }
 
 }  // namespace blink