- From: Ian Hickson <ian@hixie.ch>
- Date: Wed, 12 Mar 2014 17:49:56 +0000 (UTC)
- To: Rik Cabanier <cabanier@gmail.com>
- Cc: "whatwg@whatwg.org" <whatwg@whatwg.org>
On Wed, 12 Mar 2014, Rik Cabanier wrote: > > About a year ago, Google and mozilla proposed the "alpha" attribute as an > option when you create the canvas context. The wiki explains the feature > very well. [1] > Since then, Google has implemented and shipped this [2][3]. There is a > proposal to implement [4] and a patch [5] for firefox. > > An author can "feature test" by setting alpha to false and reading a pixel > in the context. If the pixel comes back with an alpha of 0, it means that > it is not supported. > > Could this be added to the HTML specification? [6] It's being tracked here: https://www.w3.org/Bugs/Public/show_bug.cgi?id=23515 It's awaiting interest from a second vendor. It's not clear to me from the Mozilla bug whether Mozilla engineers actually support this. -- Ian Hickson U+1047E )\._.,--....,'``. fL http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,. Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
Received on Wednesday, 12 March 2014 17:51:02 UTC