Implementation of CSS3 nav-up/down/left/right properties from CSS3 UI.

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
+ * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
@@ skipping 3387 matching lines @@
         return;
 
     if (!isSpatialNavigationEnabled(m_frame))
         return;
 
     // Arrows and other possible directional navigation keys can be used in design
     // mode editing.
     if (m_frame->document()->inDesignMode())
         return;
 
+    if (page->focusController().handleCSSFocusNavigation(focusType)) {
+        event->setDefaultHandled();
+        return;
+    }
+
     if (page->focusController().advanceFocus(focusType))
         event->setDefaultHandled();
 }
 
 void EventHandler::defaultTabEventHandler(KeyboardEvent* event)
 {
     ASSERT(event->type() == EventTypeNames::keydown);
 
     // We should only advance focus on tabs if no special modifier keys are held down.
     if (event->ctrlKey() || event->metaKey())
@@ skipping 458 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink