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Re: Html5 canvas accessibility

for

From: paniz alipour
Date: Mar 27, 2011 7:18AM


Hi,

Sorry but some how I dizzy!

Let's overview all the things that I understood:

1.About IE9 ,you told me that is the partial solution (focus ring and also
tab order),
It support sub-DOM for canvas that we can use html alternatives in the
canvas element.OK?

So ,We can't use some approaches for accessibility in these Html
alternatives?

Best Regards

On Fri, Mar 25, 2011 at 2:57 PM, Steve Faulkner < <EMAIL REMOVED> >wrote:

> hi Paniz.
>
> the content of the canvas cannot itself be made accessible, it is
> merely pixels, what is drawn on the screen has no inherent meaning or
> semantics that can be convyed to assitive technology. What is required
> is that an alternative is supplied using HTML.
> The effect of the IE implementation is that
> The HTML alternative can be provided by placing content inside the
> <canvas> tags rather than elsewhere on the page. Interaction with HTML
> content inside the canvas tags can be hooked up with what is drawn on
> the canvas using Javascript.
>
> There are pieces missing that are required to make the interaction
> between html content inside the canvas tags and what is drawm on the
> screen. These pieces are still being developed and specified.
>
> these include:
> a method to draw a focus ring on the canvas to indicate an area of the
> canvas has focus and that focus ring is associated with a html element
> such as a link or control inside the canvas tags.
> a method to indicate a caret
>
> the links josh provided go into more detail about these.
>
> regards
> stevef
>
> On 25 March 2011 09:43, paniz alipour < <EMAIL REMOVED> > wrote:
> > Hi joshue,
> >
> > By this sentence:
> > "So should you now built stuff that you want to be accessible in
> <canvas>?
> > Nope."
> > you mean as a developer,or no as a person who wants to try making canvas
> > accessible?
> >
> > How can I access the works that has been done on this area?
> >
> > And I have a question about IE9,whether it's problem really has been
> solved?
> >
> > Maybe in fact the canvas accessibility is not completely clear for me,
> >
> > I will be thankful if any body explain it's problem in a sentence,because
> I
> > dizzy,in some blog post for 2009 I read that the problem is about
> fallback
> > content,that it seems by release of IE9 it has been solved:(
> >
> > So....?!
> >
> > Thanks because of your guidance
> >
> >
> >
> > On Fri, Mar 25, 2011 at 1:38 PM, Joshue O Connor < <EMAIL REMOVED>
> >wrote:
> >
> >> Hi Paniz,
> >>
> >> > I am researching about html5 canvas accessibility ,I want to know more
> >> > information about it.
> >> >
> >> > Any body knows what's the status of canvas accessibility?
> >>
> >> Please have a look at the following for more info [1].
> >>
> >> If you wish to follow the issue (as it happens as such) have a look at
> >> the minutes of <canvas> meetings. [2]
> >>
> >> If that's too much, a doc that outlines some of the a11y issues with
> >> <canvas> may help to explain things. [3]
> >>
> >> This is really an issue in flux. It is nowhere near resolved (IMO).
> >> There have been some interesting development such as IE 9 claiming
> >> support for the canvas a11y, basically a navigable sub DOM that supports
> >> fallback content nested inside the <canvas> element.
> >>
> >> So in short, is <canvas> accessible? Not yet. Is there work being done
> >> on this? Yes.
> >>
> >> So should you now built stuff that you want to be accessible in
> >> <canvas>? Nope.
> >>
> >> HTH
> >>
> >> Josh
> >>
> >> [1]
> >>
> >>
> http://www.paciellogroup.com/blog/2010/09/html5-canvas-accessibility-in-internet-explorer-9/
> >> [2] http://www.w3.org/WAI/PF/HTML/wiki/Canvas/Meetings/Minutes
> >> [3] http://www.w3.org/html/wg/wiki/AddedElementCanvas
> >>
> >>
> >>
> >>
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> >
> > --
> > Paniz Alipour
> >