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GWT 2.3 will Support IE9 (Microsoft Windows Internet Explorer 9)

Google today announced that GWT 2.3 (in progress) will support IE9.

“In keeping with GWT philosophy of making it possible to write no-compromise AJAX in any modern browser, 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,” explains Google.

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 IE, see Defining Document Compatibility article on MSDN.

The IE9 dev mode issue reported back in Dec is fixed in GWT 2.2.0.

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
  • [Source]

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