Tests that appending iframe with with no URL and setting its URL later (including hash part) does not overwrite current history entry.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

PASS successfullyParsed is true

TEST COMPLETE


============== Back Forward List ==============
curr->  (file test):fast/history/history-length-append-subframe-with-hash.html#wentBack
            about:blank/#identifier (in frame "<!--framePath //<!--frame0-->-->")
        (file test):fast/history/resources/back-on-load.html
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