I wonder if this is something do do with our logic for bringing up the software keyboard, which maybe makes us think that some portion of the viewport, even though it's not actually? And then when we got to paint that portion of the viewport, we sometimes paint ~random garbage. That would at least explain the green artifacts halfway down the page in comment 11; and it would explain the duplicated-content that we're seeing in bug 1908583 comment 29.
Bug 1912571 Comment 30 Edit History
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I wonder if this is something do do with our logic for bringing up the software keyboard, which maybe makes us think that some portion of the viewport, even though it's not actually showing in this case in our reftest harness... So e.g. when we got to paint that portion of the viewport, we sometimes paint ~random garbage for the portion that we think is covered up by the keyboard. That would at least explain the green artifacts halfway down the page in comment 11; and it would explain the duplicated-content that we're seeing in bug 1908583 comment 29.