Sorry, the original email had lots of typos. I've fixed them below: On Mon, Oct 14, 2013 at 2:35 PM, Ryosuke Niwa <rn...@webkit.org> wrote:
> On Mon, Oct 14, 2013 at 2:28 PM, Rik Cabanier <caban...@gmail.com> wrote: > >> On Mon, Oct 14, 2013 at 1:31 PM, Timothy Hatcher <timo...@apple.com>wrote: >> >>> On Oct 14, 2013, at 12:43 PM, Rik Cabanier <caban...@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? >> > > Isn't focus ring drawn on the canvas? If so, it's important that the > focus ring fits within the canvas. e.g. consider focusing an element of > 100px by 100px inside a canvas of the same size. If the focus ring were to > be drawn around the element that currently has focus, then the entire focus > ring would be drawn outside of the visible region. > > 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? >> > > It may, for example, leak information as to whether user's machine is in > high contrast mode, which is another dimension for finger-printing user. > > - R. Niwa > >
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