This test expects the iframe to be reset on backward navigation. Back-forward cache needs to be disabled to run this test successfully.

============== Back Forward List ==============
curr->  http://127.0.0.1:8000/navigation/back-to-dynamic-iframe.html
            http://127.0.0.1:8000/navigation/resources/back-to-dynamic-iframe-iframe.html#PASS (in frame "<!--framePath //<!--frame0-->-->")
        http://127.0.0.1:8000/navigation/resources/go-back.html
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