Apply styles to mathML elements having class attribute.

third_party/WebKit/Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 11 matching lines @@
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/dom/Node.h"
 
 #include "bindings/core/v8/DOMDataStore.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/Microtask.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
 #include "core/HTMLNames.h"
+#include "core/MathMLNames.h"
 #include "core/css/CSSSelector.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/Attr.h"
 #include "core/dom/Attribute.h"
 #include "core/dom/ChildListMutationScope.h"
 #include "core/dom/ChildNodeList.h"
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentFragment.h"
@@ skipping 980 matching lines @@
         const ComputedStyle& style = layoutObject()->styleRef();
         // We allow selections to begin within an element that has -webkit-user-select: none set,
         // but if the element is draggable then dragging should take priority over selection.
         if (style.userDrag() == DRAG_ELEMENT && style.userSelect() == SELECT_NONE)
             return false;
     }
     ContainerNode* parent = FlatTreeTraversal::parent(*this);
     return parent ? parent->canStartSelection() : true;
 }
 
+// StyledElements allow inline style (style="border: 1px"), presentational attributes (ex. color),
+// class names (ex. class="foo bar") and other non-basic styling features. They and also control

[PhistucK, 2016/08/02 15:40:47]

s/They and also/Then also/

[ramya.v, 2016/08/03 04:03:48]

Done.

+// if this element can participate in style sharing.
+//
+// FIXME: The only things that ever go through StyleResolver that aren't StyledElements are
+// PseudoElements and VTTElements. It's possible we can just eliminate all the checks
+// since those elements will never have class names, inline style, or other things that
+// this apparently guards against.
+bool Node::isStyledElement() const
+{
+    return isHTMLElement() || isSVGElement() || (isElementNode() && toElement(this)->namespaceURI() == MathMLNames::mathmlNamespaceURI);
+}
+
 bool Node::canParticipateInFlatTree() const
 {
     return !isShadowRoot() && !isSlotOrActiveInsertionPoint();
 }
 
 bool Node::isSlotOrActiveInsertionPoint() const
 {
     return isHTMLSlotElement(*this) || isActiveInsertionPoint(*this);
 }
 
@@ skipping 1496 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif