test6() is pretty unstable and it makes the whole test file timeout. The test framework of ResizeObserver should continue to check the following tests even if there is a timeout (because we use window.setTimeout to check this case). So I think we should split it from observe.html and then make it an intermittent.
Bug 1725051 Comment 1 Edit History
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test6() is pretty unstable and it makes the whole test file timeout. The test framework of ResizeObserver should continue to check the following tests even if there is a timeout (because we use window.setTimeout to check this case). However, test6() may wait for a message from an iframe forever. So I think we should split it from observe.html and then make it an intermittent.