[webkit-dev] New (experimental) CSS feature: Hierarchies

[Shane Stephens]

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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