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Pro Html5 programming and canvas

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From: paniz alipour
Date: Mar 28, 2011 3:54AM

Hello,

I was reading a book:"Pro Html5 programming"

And I so this sentence:

What about Canvas accessibility?

Peter says: “Providing alternate images or alternate text raises the subject
of accessibility—an area in
which the HTML5 Canvas specification is, unfortunately, still lacking
significantly. For example, there is no
native method for inserting text alternatives for images that are being
inserted into a canvas, and there is
no native method to provide alternate text to match text generated with the
canvas text API. At the time of
this writing, there are no accessibility hooks that can be used with the
dynamically generated content in a
canvas, but a task force is working on designing them. Let’s hope this
improves with time.”

It causes some questions for me:

"For example, there is no
native method for inserting text alternatives for images that are being
inserted into a canvas, and there is
no native method to provide alternate text to match text generated with the
canvas text API"

1.I want to know a developer can't insert alternatives into canvas?

2.The problem is dynamically generated content in canvas?

Best Regards

--
Paniz Alipour