We already have direction-aware properties like margin-start and margin-end. This patch adds the -before/-after equivalents and updates everything to work with block-flow correctly.
Created attachment 68130 [details] Patch
Comment on attachment 68130 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=68130&action=review > WebCore/css/CSSProperty.cpp:67 > + } > + > + } Extra newline
Fixed in r67882.