@supports enabled by default for Firefox 22
2 April 2013 · The CSS Working Group is planning to publish the CSS Conditional Rules Module as a Candidate Recommendation soon. As a result, David Baron has landed a patch that enables the @supports rule and the CSS.supports() API by default for Firefox 22, which is scheduled to hit Release some time in May.
11 April 2013, 1:25am
[...] JavaScript which leads to brief flashes of content, hopeful code and support, and other problems. Firefox, Chrome, and Opera have just recently added support for CSS @supports (CSS) [...]
26 April 2013, 9:22am
[...] нельзя было сделать с использованием только лишь CSS. Firefox, Chrome и Opera недавно объявили о поддержке CSS [...]