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Nice write-up, Scott!
Just a few clarifications:
* `document.querySelectorAll(’:hidden’)` doesnâ€™t actually work; in other words, supporting QSA doesnâ€™t affect the performance of jQuery/Sizzleâ€™s custom selectors. (The text makes it seem like it does.)
* The reason Opera scores so well in QS/QSA tests is because it caches the results. It would be tricky but interesting to create a performance test case that works around this by avoiding repeated selectors.