Bug 1962598 implements fallbacks at layout time. So just need to force a layout if positioned rect + offset overflows its abs-cb and we have fallbacks to try. (`position-visibility` hiding paint-time, so it won't force layout, but it's likely checked here)
Bug 1987965 Comment 1 Edit History
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Bug 1962598 implements fallbacks at layout time. So just need to force a layout if positioned rect + offset overflows its abs-cb and we have fallbacks to try. (`position-visibility` hiding is at paint-time, so it won't force layout, but it's likely checked here)