Issue #3: Is ARIA supported?
aria-browser-role-support-web.jpg
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–To use ARIA you need a browser that both supports ARIA and is supported by a screen reader that also support ARIA.
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•ARIA-aware OS/browser/AT combinations are some way off becoming the norm.
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–Browsers:
–Firefox 1.5+, Opera 9.5+, IE8, WebKit
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http://www.paciellogroup.com/blog/aria-tests/ARIA-SafariaOperaIEFF.html
ARIA-aware OS/browser/AT combinations are some way off becoming the norm.

This is really important: To use ARIA you need a browser that both support ARIA and is supported by a screen reader that also support ARIA.

Browsers.
Firefox 1.5+, Opera 9.5+, IE8, WebKit are in various stages of implementing the specification. BUT:

Webkit support in both Mac & Windows is poor.

Support is patchy even in best browsers.