[Webkit-unassigned] [Bug 194289] [iOS] Glitch free fixed positioning with async scrolling in frames

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194289

--- Comment #5 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Things to test while you're working on this (all should test with busy content that is triggering layouts):

* fixed in the main frame
* fixed in subframes
* fixed in overflow scroll (can test the shipping code path with -webkit-overflow-scrolling: touch)
* sticky relative to the main frame
* sticky relative to overflow scroll (-webkit-overflow-scrolling: touch)
* behavior of fixed when zoomed on iOS (layout vs. visual viewports)
* behavior of fixed while zooming on iOS (layout/visual viewports)

Test everything on macOS too, including with zooming.

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