CSS Custom Properties (Variables)

Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 130 matching lines @@
     case ReflectionLeft:
         m_value.valueID = CSSValueLeft;
         break;
     case ReflectionRight:
         m_value.valueID = CSSValueRight;
     }
 }
 
 template<> inline CSSPrimitiveValue::operator CSSReflectionDirection() const
 {
-    ASSERT(isValueID());
+    ASSERT(isValueID() || isVariableReference());
     switch (m_value.valueID) {
     case CSSValueAbove:
         return ReflectionAbove;
     case CSSValueBelow:
         return ReflectionBelow;
     case CSSValueLeft:
         return ReflectionLeft;
     case CSSValueRight:
         return ReflectionRight;
     default:
@@ skipping 4505 matching lines @@
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return ScrollSnapTypeNone;
 }
 
 } // namespace blink
 
 #endif