[whatwg] canvas context "alpha" attribute

[Rik Cabanier]

On Wed, Mar 12, 2014 at 10:49 AM, Ian Hickson <ian at hixie.ch> wrote:

> 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.
>

See roc's reply here:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/4KMwyiaOxHg