(In reply to Brad Werth [:bradwerth] from comment #1) > ...and I've confirmed that both call sites noted in comment 1 are hit on the www.pixellot.tv site, which was the in-the-wild sighting for this issue. Yes, but: both call sites are hit, but for pixellot.tv the logic at the first site `FlattenedStackingContext.is_redundant` concludes that the stacking context *is not* redundant, which makes this potential optimization not useful for that site. This may still have some value for cases where mix-blend-mode is applied to the first primitive in a stacking context, where `FlattenedStackingContext.is_redundant` returns true.
Bug 1683440 Comment 2 Edit History
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(In reply to Brad Werth [:bradwerth] from comment #1) > ...and I've confirmed that both call sites noted in comment 1 are hit on the www.pixellot.tv site, which was the in-the-wild sighting for this issue. Yes, but: both call sites are hit, but for pixellot.tv the logic at the first site `FlattenedStackingContext.is_redundant` concludes that the stacking context *is not* redundant, which makes this potential optimization not useful for that site. This may still have some value for cases where mix-blend-mode is applied to the first primitive in a stacking context, where `FlattenedStackingContext.is_redundant` returns true.