So, page 3 finds that page 2 has remaining overflow that it needs to paint. Page 2 has a flex item continuation with `scr-overflow=(x=0, y=0, w=44276, h=138880)`. That scrollable overflow height is more than two pages. The flex item only contains a float child with (x=120, y=0, w=44036, h=60314) and no scrollable overflow. So I don't see where that large overflow came from. Perhaps we did a measuring reflow of the item that gave it the larger overflow and then we didn't reset the areas before the final reflow? Page 2 contains the `<picture>` element, btw. (cue the Twilight Zone theme...)
Bug 1695509 Comment 6 Edit History
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So, page 3 finds that page 2 has remaining overflow that it needs to paint. Page 2 has a flex item continuation with `scr-overflow=(x=0, y=0, w=44276, h=138880)`. That scrollable overflow height is more than two pages. The flex item only contains a float child with `(x=120, y=0, w=44036, h=60314)` and no scrollable overflow. So I don't see where that large overflow came from. Perhaps we did a measuring reflow of the item that gave it the larger overflow and then we didn't reset the areas before the final reflow? Page 2 contains the `<picture>` element, btw. (cue the Twilight Zone theme...)