I just landed a patch to implement the #rgba and #rrggbbaa syntax for colors in CSS, and realized I probably should have sent an intent to dev-platform slightly sooner.
This is an additional syntax for an existing feature already usable as the rgba() and hsla() color functions, commonly requested by developers, and recently implemented in both Chromium and WebKit. I figured we may as well add it now both because it's popular and because we're likely to have to for compatibility soon enough. It allows, for example, the color previously specifiable as rgba(221, 34, 170, 0.6) or to be specified as #d2a9 or #dd22aa99. (rgb(221, 34, 170) has always been specifiable as #d2a or #dd22aa; this just extends the compact hexadecimal syntax to allow alpha.) It affects only colors specified in CSS, and not those specified in HTML attributes. Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=567283 Spec: https://drafts.csswg.org/css-color-4/#hex-notation Target release: Firefox 49 -David -- 𝄞 L. David Baron http://dbaron.org/ 𝄂 𝄢 Mozilla https://www.mozilla.org/ 𝄂 Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense. - Robert Frost, Mending Wall (1914)
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