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   *** NOT FOR LANDING *** Unprefix multicol behind a flag
Try to unprefix multicol, depending on the UnprefixMulticol runtime flag.
A lot of work is required to keep the unprefixed properties unexposed
if the flag is disabled, though.
Still not done. Regular parsing and getComputedStyle should work, but e.g.
document.getElementById("foo").style.columnCount doesn't work as expected when
the flag is disabled.
   
  
  
  
    
  
  
    
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            Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
          
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            Source/core/animation/LengthStyleInterpolation.cpp
          
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            Source/core/animation/StringKeyframe.cpp
          
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            Source/core/animation/css/CSSAnimatableValueFactory.cpp
          
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            Source/core/animation/css/CSSPropertyEquality.cpp
          
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            Source/core/css/CSSComputedStyleDeclaration.cpp
          
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            Source/core/css/CSSProperties.in
          
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            Source/core/css/ComputedStyleCSSValueMapping.h
          
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            Source/core/css/ComputedStyleCSSValueMapping.cpp
          
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            Source/core/css/PropertySetCSSStyleDeclaration.cpp
          
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            Source/core/css/StylePropertySerializer.cpp
          
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            Source/core/css/StylePropertySet.cpp
          
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            Source/core/css/parser/CSSParserFastPaths.cpp
          
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            Source/core/css/parser/CSSPropertyParser.cpp
          
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            Source/core/css/resolver/AnimatedStyleBuilder.cpp
          
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            Source/core/css/resolver/StyleBuilderCustom.cpp
          
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            Source/core/frame/UseCounter.cpp
          
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            Source/core/layout/LayoutMultiColumnSet.cpp
          
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            Source/core/paint/BlockPainter.cpp
          
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            Source/core/paint/MultiColumnSetPainter.cpp
          
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            Source/core/style/ComputedStyle.cpp
          
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            Source/platform/RuntimeEnabledFeatures.in
          
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