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Re: Well formed verses Valid code


From: Alastair Campbell
Date: Feb 26, 2007 2:00PM

> the two screen readers that are referenced in
> this post don't parse the HTML themselves - they use MSAA or
> the DOM to get their interpretation of the content.

I believe older versions of JAWs parsed the HTML independently of the
browser, something that has changed since version 7.1.

Wouldn't there be a potential for different processing by the screen
readers compared to the browsers? Especially for non-valid or not well
formed markup.

Ian Hickson produced a tool to evaluate the DOM trees (probably
available from here but I can't access it right now:

I'm not sure whether that would work for checking screen readers, but it
might be necessary to use something like that to test for differences.

Kind regards,


Alastair Campbell | Director of User Experience

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