Primary eng (and PM) emails
Summary
Remove unfinished implementation of the CSS Variables spec.
http://www.w3.org/TR/css-variables-1/
Motivation
Our CSS Variables implementation in its current state needs a rewrite before it is ready to ship.
Our Bison CSS Parser is slated to be rewritten from scratch, this would result in another rewrite of the variables implementation.
If we were to ship CSS Variables with our current parser we would see little performance benefit over using a Javascript framework to accomplish the same thing.
Usage information from UseCounter
CSS Variables usage is not counted.
Compatibility Risk
CSS Variables is not shipped, removal poses minimal disruption to the web.
Firefox has an implementation in progress available on their Nightly channel.
https://hacks.mozilla.org/2013/12/css-variables-in-firefox-nightly/
Webkit has removed their implementation (which we inherited).
https://bugs.webkit.org/show_bug.cgi?id=114119
Row on feature dashboard
http://www.chromestatus.com/features/6401356696911872