In keeping with the GWT philosophy of making it possible to write
no-compromise AJAX in any modern browser, GWT 2.3 (in progress) will support
IE9. We're adding a new user.agent property "ie9" and the notion of fallback
properties, so any browser-specific bindings not yet implemented in ie9 will
fall back to ie8 and show a compile-time warning that a fallback impl was
used.

In the mean time, you can tell IE9 to behave as IE8 by inserting the
following in the head section of your GWT host page:
<meta http-equiv="X-UA-Compatible" content="IE=8" />

Assuming that IE continues to maintain backward compatibility, you may want
to insert the equivalent tag for IE9 once GWT 2.3 ships in order to make
your app somewhat future-proof for future IE versions. For more information
on document compatibility in Internet Explorer, see
http://msdn.microsoft.com/en-us/library/cc288325(VS.85).aspx

The IE9 dev mode issue reported back in Dec is fixed in GWT 2.2.0:
http://googlewebtoolkit.blogspot.com/2010/12/support-for-gwt-dev-mode-in-ie-9.html

You can follow the status of known IE9 issues here:
http://code.google.com/p/google-web-toolkit/issues/detail?id=5125
http://code.google.com/p/google-web-toolkit/issues/detail?id=6134
http://code.google.com/p/google-web-toolkit/issues/detail?id=6135
http://code.google.com/p/google-web-toolkit/issues/detail?id=6136

-- 
David Chandler
Developer Programs Engineer, Google Web Toolkit
w: http://code.google.com/
b: http://googlewebtoolkit.blogspot.com/
t: @googledevtools

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