Assert relative changes in history.length in same-url.html
#48278
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All browsers except Firefox spuriously fail the precondition in `onload` [0] because their history includes `about:blank` (initially loaded by WebDriver [1, 2]), followed by `same-url.html`. Avoid encoding this implementation detail in the test. Also, add the current state to each assertion to make failure more informative. [0]: https://wpt.fyi/results/html/browsers/browsing-the-web/history-traversal/same-url.html?run_id=5145442707046400&run_id=5078811356168192&run_id=5154571592925184&run_id=6326848455966720 [1]: https://www.w3.org/TR/webdriver/#new-window [2]: https://github.com/web-platform-tests/wpt/blob/3939cbfd/tools/wptrunner/wptrunner/executors/executorwebdriver.py#L811-L818
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All browsers except Firefox spuriously fail the precondition in
onloadbecause their history includesabout:blank(initially loaded by WebDriver), followed bysame-url.html. Avoid encoding this implementation detail in the test.Also, add the test state to each assertion to make failure more informative.