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I think the issue is that IE9/10 don't have native mutation observers, so the timing of mutation observers isn't (necessarily) any faster than "new Future". What we do now is wait for the "option" to get expanded before trying to run the test. R=sigmund@google.com Review URL: https://codereview.chromium.org//86153003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@30646 260f80e4-7a28-3924-810f-c04153c831b5