You can start providing a patch (with appropriate test) for cross-origin XHR: if it is supported in FF3.5 and not in HtmlUnit simulating FF3.5, then it is a bug in HtmlUnit.
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As far as I can tell, none of the team member currently works on it, therefore patches are welcome ;-)
See
http://htmlunit.sourceforge.net/submittingPatches.html
Just curious: which browsers do support XHR level 2?
May have a look at http://caniuse.com/xhr2.
Full support is available for the browsers FF 4, Chrome 7 and Safari 5.1.
What I'm most interested in is the cross-origin request support which is available since FF 3.5.
Thanks for the info.
You can start providing a patch (with appropriate test) for cross-origin XHR: if it is supported in FF3.5 and not in HtmlUnit simulating FF3.5, then it is a bug in HtmlUnit.
I think our XMLHttpRequest support is now in really good shape