[Webkit-unassigned] [Bug 117059] iOS touch scrolling doesn't take occluding elements into account

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117059

--- Comment #4 from tahoon at microsoft.com ---
Still reproduces easily in iOS 12. Tested on iOS 9, 10, and 11 also.

See attachment 354696. Swiping vertically anywhere on the layer above will scroll the layer below if the latter has -webkit-overflow-scrolling:touch. This also reproduces if the bottom layer has position:static.

Does not repro if the layer below has -webkit-overflow-scrolling:auto.

If the top layer is scrollable, then swiping the top layer will correctly scroll that layer only…until the start or end of the scrolling box is reached. Attempting to scroll past it will incorrectly scroll the layer below.

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