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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