[whatwg] Alignment of empty buttons

[Tab Atkins Jr.]

On Mon, Nov 25, 2013 at 4:32 AM, Boris Zbarsky <bzbarsky at 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