APZ scrolling appears to be entirely broken on this page, using my mousewheel or keyboard, nothing moves. This causes the talos test tscrollx to report 0 for this subtest, since it never moves. Scrolling using the scrollbar seems to work fine.
My understanding is that SVG gets drawn into a blob image, and we assume that the whole image scrolls together. I think that means that APZ will think that scroll events should be directed to the root scroll frame, which isn't scrollable, and nothing happens. This page has a <foreignObject> element, with a scrollable iframe within that, so things don't work. I'm not sure if we can easily have proper handling for content within a blob, so maybe we need to add to APZs 'dispatch to content' region for the blob if it contains foreignObject (or content with a different ASR?).
This is the same as bug 1449634
Status: NEW → RESOLVED
Closed: 10 months ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1449634
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