On Mon, Nov 25, 2013 at 4:32 AM, Boris Zbarsky <bzbar...@mit.edu> wrote: > That's pure CSS: it's a !important rule in a UA stylesheet. I guess you > could claim that supporting !important in a UA stylesheet is a proprietary > extension, albeit one that's in the process of being specified.
Already specced and in CR: <http://dev.w3.org/csswg/css-cascade/#cascade-origin> ~TJ