[webkit-dev] Proposal: Add support for focus rings in Canvas 2d

[Rik Cabanier]

On Mon, Oct 14, 2013 at 1:31 PM, Timothy Hatcher <timothy at apple.com> wrote:

> On Oct 14, 2013, at 12:43 PM, Rik Cabanier <cabanier at gmail.com> wrote:
>
> Also, how would your suggestion tell the UA about what areas are
> associated with the elements? What happens if an element is no longer
> focused? The ring is drawn into the canvas bitmap so those pixels have to
> be regenerated.
>
>
> Focus rings are usually larger than the control they surround. How is the
> developer suppose to know the pixel padding needed for each platform's
> focus ring? Guess and hope for the best?
>

Why would he need to know this? Is it for the path that describes the ring?


> Would drawing the system focus ring taint the canvas pixels? (Drawing form
> controls into canvas via SVG images and <foreignObject> has been considered
> taint worthy because it could leak the user's UI theme.)
>

I'm unsure if it should taint the canvas. How much information would be
leaked that isn't already available through other means?
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