Stop propagating text decorations on outermost SVG roots

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/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 80 matching lines @@
     case TABLE_CAPTION:
         return BLOCK;
     case NONE:
         ASSERT_NOT_REACHED();
         return NONE;
     }
     ASSERT_NOT_REACHED();
     return BLOCK;
 }
 
+static bool isOutermostSVGElement(const Element* e)
+{
+    return e && e->isSVGElement() && toSVGElement(*e).isOutermostSVGSVGElement();
+}
+
 // CSS requires text-decoration to be reset at each DOM element for tables,
 // inline blocks, inline tables, shadow DOM crossings, floating elements,
-// and absolute or relatively positioned 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* e)
 {
     return style.display() == TABLE || style.display() == INLINE_TABLE
         || style.display() == INLINE_BLOCK || style.display() == INLINE_BOX || isAtShadowBoundary(e)
-        || style.isFloating() || style.hasOutOfFlowPosition();
+        || style.isFloating() || style.hasOutOfFlowPosition() || isOutermostSVGElement(e);
 }
 
 // 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() == BACKDROP;
 }
 
 static bool parentStyleForcesZIndexToCreateStackingContext(const ComputedStyle& parentStyle)
@@ skipping 363 matching lines @@
     if (style.writingMode() != TopToBottomWritingMode && (style.display() == BOX || style.display() == INLINE_BOX))
         style.setWritingMode(TopToBottomWritingMode);
 
     if (parentStyle.isDisplayFlexibleOrGridBox()) {
         style.setFloating(NoFloat);
         style.setDisplay(equivalentBlockDisplay(style.display(), style.isFloating(), !m_useQuirksModeStyles));
     }
 }
 
 }