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

Source/core/css/parser/BisonCSSParser-in.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 394 matching lines @@
         return valueID == CSSValueAuto || valueID == CSSValueWebkitOptimizeContrast || (RuntimeEnabledFeatures::imageRenderingPixelatedEnabled() && valueID == CSSValuePixelated);
     case CSSPropertyIsolation: // auto | isolate
         ASSERT(RuntimeEnabledFeatures::cssCompositingEnabled());
         return valueID == CSSValueAuto || valueID == CSSValueIsolate;
     case CSSPropertyListStylePosition: // inside | outside
         return valueID == CSSValueInside || valueID == CSSValueOutside;
     case CSSPropertyListStyleType:
         // See section CSS_PROP_LIST_STYLE_TYPE of file CSSValueKeywords.in
         // for the list of supported list-style-types.
         return (valueID >= CSSValueDisc && valueID <= CSSValueKatakanaIroha) || valueID == CSSValueNone;
+    case CSSPropertyNavDown:

[Timothy Loh, 2014/10/01 13:14:53]

This is unreachable. We'd only get here is these values were in
isKeywordPropertyID (which the nav-* properties aren't!)

+    case CSSPropertyNavLeft:
+    case CSSPropertyNavRight:
+    case CSSPropertyNavUp: // current | root
+        return valueID == CSSValueCurrent || valueID == CSSValueRoot;
     case CSSPropertyObjectFit:
         return valueID == CSSValueFill || valueID == CSSValueContain || valueID == CSSValueCover || valueID == CSSValueNone || valueID == CSSValueScaleDown;
     case CSSPropertyOutlineStyle: // (<border-style> except hidden) | auto
         return valueID == CSSValueAuto || valueID == CSSValueNone || (valueID >= CSSValueInset && valueID <= CSSValueDouble);
     case CSSPropertyOverflowWrap: // normal | break-word
     case CSSPropertyWordWrap:
         return valueID == CSSValueNormal || valueID == CSSValueBreakWord;
     case CSSPropertyOverflowX: // visible | hidden | scroll | auto | overlay
         return valueID == CSSValueVisible || valueID == CSSValueHidden || valueID == CSSValueScroll || valueID == CSSValueAuto || valueID == CSSValueOverlay;
     case CSSPropertyOverflowY: // visible | hidden | scroll | auto | overlay | -webkit-paged-x | -webkit-paged-y
@@ skipping 1638 matching lines @@
     rule->setProperties(createStylePropertySet());
     clearProperties();
 
     StyleRuleViewport* result = rule.get();
     m_parsedRules.append(rule.release());
 
     return result;
 }
 
 }