Remove the concept of document.documentElement

sky/engine/core/css/resolver/StyleResolver.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 177 matching lines @@
     StyleResourceLoader loader(m_document.fetcher());
     loader.loadPendingResources(state.style(), state.elementStyleResources());
     m_document.styleEngine()->fontSelector()->fontLoader()->loadPendingFonts();
 }
 
 PassRefPtr<RenderStyle> StyleResolver::styleForElement(Element* element, RenderStyle* defaultParent)
 {
     ASSERT(m_document.frame());
     ASSERT(m_document.settings());
 
-    if (element == m_document.documentElement())
-        m_document.setDirectionSetOnDocumentElement(false);
     StyleResolverState state(m_document, element, defaultParent);
 
     if (state.parentStyle()) {
         SharedStyleFinder styleFinder(state.elementContext(), *this);
         if (RefPtr<RenderStyle> sharedStyle = styleFinder.findSharedStyle())
             return sharedStyle.release();
     }
 
     if (state.parentStyle()) {
         state.setStyle(RenderStyle::create());
@@ skipping 55 matching lines @@
 }
 
 PassRefPtr<AnimatableValue> StyleResolver::createAnimatableValueSnapshot(StyleResolverState& state, CSSPropertyID property, CSSValue& value)
 {
     StyleBuilder::applyProperty(property, state, &value);
     return CSSAnimatableValueFactory::create(property, *state.style());
 }
 
 PassRefPtr<RenderStyle> StyleResolver::defaultStyleForElement()
 {
-    StyleResolverState state(m_document, 0);
+    StyleResolverState state(m_document, nullptr);
     state.setStyle(RenderStyle::create());
     state.fontBuilder().initForStyleResolve(m_document, state.style());
     state.style()->setLineHeight(RenderStyle::initialLineHeight());
     state.setLineHeightValue(0);
     state.fontBuilder().setInitial();
     state.style()->font().update(m_document.styleEngine()->fontSelector());
     return state.takeStyle();
 }
 
 PassRefPtr<RenderStyle> StyleResolver::styleForText(Text* textNode)
@@ skipping 285 matching lines @@
     if (!m_styleResolverStats)
         return;
     fprintf(stderr, "=== Style Resolver Stats (resolve #%u) (%s) ===\n", ++m_styleResolverStatsSequence, m_document.url().string().utf8().data());
     fprintf(stderr, "%s\n", m_styleResolverStats->report().utf8().data());
     fprintf(stderr, "== Totals ==\n");
     fprintf(stderr, "%s\n", m_styleResolverStatsTotals->report().utf8().data());
 }
 
 void StyleResolver::applyPropertiesToStyle(const CSSPropertyValue* properties, size_t count, RenderStyle* style)
 {
-    StyleResolverState state(m_document, m_document.documentElement(), style);
+    StyleResolverState state(m_document, nullptr, style);
     state.setStyle(style);
 
     state.fontBuilder().initForStyleResolve(m_document, style);
 
     for (size_t i = 0; i < count; ++i) {
         if (properties[i].value) {
             // As described in BUG66291, setting font-size and line-height on a font may entail a CSSPrimitiveValue::computeLengthDouble call,
             // which assumes the fontMetrics are available for the affected font, otherwise a crash occurs (see http://trac.webkit.org/changeset/96122).
             // The updateFont() call below updates the fontMetrics and ensure the proper setting of font-size and line-height.
             switch (properties[i].property) {
             case CSSPropertyFontSize:
             case CSSPropertyLineHeight:
                 updateFont(state);
                 break;
             default:
                 break;
             }
             StyleBuilder::applyProperty(properties[i].property, state, properties[i].value);
         }
     }
 }
 
 } // namespace blink