Option, checkbox and radio should support ':default' selector

third_party/WebKit/Source/core/html/HTMLOptionElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility, Inc.  All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 97 matching lines @@
 }
 
 bool HTMLOptionElement::supportsFocus() const
 {
     RefPtrWillBeRawPtr<HTMLSelectElement> select = ownerSelectElement();
     if (select && select->usesMenuList())
         return false;
     return HTMLElement::supportsFocus();
 }
 
+bool HTMLOptionElement::isDefaultButtonForForm() const
+{
+    return fastHasAttribute(selectedAttr);
+}
+
 String HTMLOptionElement::displayLabel() const
 {
     Document& document = this->document();
     String text;
 
     // WinIE does not use the label attribute, so as a quirk, we ignore it.
     if (!document.inQuirksMode())
         text = fastGetAttribute(labelAttr);
 
     // FIXME: The following treats an element with the label attribute set to
@@ skipping 347 matching lines @@
         ASSERT(parent);
         if (isHTMLOptGroupElement(*parent)) {
             const ComputedStyle* parentStyle = parent->computedStyle() ? parent->computedStyle() : parent->ensureComputedStyle();
             return !parentStyle || parentStyle->display() == NONE;
         }
     }
     return m_style->display() == NONE;
 }
 
 } // namespace blink