I add the test as a crashtest, and push to try to see if I can reproduce it on Android. It turns out it didn't trigger any assertion on Android platforms. https://treeherder.mozilla.org/#/jobs?repo=try&revision=3e19004c28548395c79cde954f72a4f8fc52544c This could bee fixed by any of the recent column-span bugs of mine. Since it's harder to find the exact bug that fixed this for Android by using mozregression, I'll just add the crashtest.
Bug 1571897 Comment 5 Edit History
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I add the test as a crashtest, and push to try to see if I can reproduce it on Android. It turns out it didn't trigger any assertion on Android platforms. https://treeherder.mozilla.org/#/jobs?repo=try&revision=3e19004c28548395c79cde954f72a4f8fc52544c This could be fixed by any of the recent column-span bugs of mine. Since it's harder to find the exact bug that fixed this for Android by using mozregression, I'll just add the crashtest.