Re: handling focus

Hi James,

>In the shadow DOM proof of concept I developed, I just drew the focus ring
with the canvas. I don't see any need to have a native focus ring drawn on
top of >the canvas. I'd say, leave a custom view like canvas for the author
to manage.

How do AT such as screen magnifiers provide focus highlighting of
interactive parts of the canvas if native focus is not provided?
How are they able to follow and bring currently focused elements into the
viewport if there  focus is not programmatically exposed provided?
I consider a solution that does not satisfy the following section 508
criteria [1] as inadequate and have yet to see any proposal that satisfies
this:

§ 1194.21 Software applications and operating systems.
(c) A well-defined on-screen indication of the current focus shall be
provided that moves among interactive interface elements as the input focus
changes. The focus shall be programmatically exposed so that assistive
technology can track focus and focus changes.

[1] http://www.section508.gov/index.cfm?FuseAction=Content&ID=12#Software

regards
Stevef
2009/11/16 James Craig <jcraig@apple.com>

> On Nov 16, 2009, at 5:27 AM, Steven Faulkner wrote:
>
> > at TPAC the provision of a method to draw focus rectangles on a canvas
> was discussed, and it appeared that this was considered necessary,
>
> In the shadow DOM proof of concept I developed, I just drew the focus ring
> with the canvas. I don't see any need to have a native focus ring drawn on
> top of the canvas. I'd say, leave a custom view like canvas for the author
> to manage.
>
> > how does this fit in with the use of active-descendent to track focus in
> a shadow DOM?
>
> Only using 'active-descendant' would allow for a shadow DOM as deep as one
> managed focus widget. This is fine, but a standard focus model inside the
> shadow DOM is necessary, too. Otherwise you'd need to render a separate
> canvas element for every complex widget, so something as complex as Bespin
> could never be achieved by using a single active descendant.
>
>
>


-- 
with regards

Steve Faulkner
Technical Director - TPG Europe
Director - Web Accessibility Tools Consortium

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