Hi webkit-dev, I'd like to introduce an experimental implementation of a new CSS feature called "hierarchies". A current Editor's Draft of the feature can be found here: http://dev.w3.org/csswg/css3-hierarchies/.
Hierarchies was first proposed to the www-style mailing list in 2011: http://lists.w3.org/Archives/Public/www-style/2011Jun/0022.html. It has since been discussed both on-list and by the CSSWG in person a number of times, and eventual inclusion of the feature as part of a CSS standard has the broad support of the CSSWG. This work will be done behind a ENABLE_CSS_HIERARCHIES flag. This flag will be used to prevent the feature from being exposed to the web, but will not necessarily guard all new code introduced to support the feature. A WIP implementation can be found at: https://bugs.webkit.org/show_bug.cgi?id=79939. I will be adding the feature flag over the next few days, after which time I will begin seeking reviews. Cheers, -Shane
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