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[Bug 10964] Canvas needs to support a backing store in the DOM subtree capable of supporting screen reading

From: <bugzilla@jessica.w3.org>
Date: Thu, 02 Dec 2010 14:41:39 +0000
To: public-html-a11y@w3.org
Message-Id: <E1POALr-000492-OV@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10964

--- Comment #7 from Rich Schwerdtfeger <schwer@us.ibm.com> 2010-12-02 14:41:37 UTC ---
We have separated out caret and selection tracking into defects:
11239 and 11240. To clarify, yes canvas subtree is a shadow DOM for what is
rendered on canvas. That said, canvas API must support the ability to drive
screen reader while a user moves the caret and and selection point on the
physical canvas. This must be a physical screen position. So, you are correct
Tab, that this really belongs to the Canvas 2D API and it will also impact
contenteditable areas. So that we can bind the caret and selection information
to the visible rendering on canvas. 

Currently, the <canvas> spec. now provides for this subtree which is navigeable
from the keyboard and this subtree can be mapped to the accessibility API. This
is now implemented in IE 9. So, I believe this bug is fully resolved.

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