On Mon, Oct 14, 2013 at 2:38 PM, Ryosuke Niwa <rn...@webkit.org> wrote:
> 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. >> > True. That sounds like bad design though. Wouldn't you have the same problem with focusable content in an "overflow:hidden" element that just fits its child? > >> 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. >> > Yes, maybe this should taint. Dominic, what do you think?
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