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The timeouts happened due to a popup of IE9 warning that the site uses Java.

The issue has been fixed, on the bot, the following three tests are left which refer to this bug -- they are failing:

polymer/test/bind_mdv_test: RuntimeError # Issue #14412, 13260
polymer/test/custom_event_test: RuntimeError # Issue #13260
polymer/test/noscript_test: RuntimeError # Issue #13260

wow - thanks Martin for the update! Those timeouts have been a mystery for a while.

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noscript_test is flaky. Sometimes passes.
I'm updating the status file.

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looks like only polymer/test/noscript test is left.

I wonder if it is more reliable on IE10/11? IE9 didn't have reliable timing primitives whereas I think 10+ does. (and Polymer doesn't support IE9 anymore so status on IE9 should be a non-issue)

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This issue has been moved to dart-archive/polymer-dart#78.