The `negative-overflow.html` failures demonstrate the testcase attached here, where reversing the cross-axis (`flex-wrap:wrap-reverse`) can create overflow. My proposed patches allow the overflow to be scrollable. For now, the testcase doesn't work in Google Chrome 86. I guess Google Chrome only tweaks the scroll area when the main-axis is reversed, but not the cross-axis. I don't see any reason to treat main and cross different in terms of scrollability. We already have existing failures in `negative-overflow.html` tracked in bug 1626108, so I'm going to adjust the test expectation in Part 4, and reland my patches. We can do follow-up there and reason the correctness of the testcase. Daniel, does the plan sound good to you?
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The `negative-overflow.html` failures demonstrate the testcase attached here, where reversing the cross-axis (`flex-wrap:wrap-reverse`) can create overflow. My proposed patches allow the overflow to be scrollable. For now, the testcase doesn't work in Google Chrome 86. I guess Google Chrome only tweaks the scroll area when the main-axis is reversed, but not the cross-axis. I don't see any reason to treat main and cross different in terms of scrollability. We already have existing failures in `negative-overflow.html` tracked in bug 1626108, so I'm going to adjust the test expectation in [Part 4](https://phabricator.services.mozilla.com/D86078), and reland my patches. We can do follow-up there and reason the correctness of the testcase. Daniel, does the plan sound good to you?