[Webkit-unassigned] [Bug 65259] Safari flashes scrollbar for overflow:auto/scrollbar elements that are hidden behind other elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=65259

jonjohnjohnson <hi at jonjohnjohnson.com> changed:

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                 CC|                            |hi at jonjohnjohnson.com

--- Comment #5 from jonjohnjohnson <hi at jonjohnjohnson.com> ---
bdakin at apple.com Any changes/thoughts on this in the last seven years?

It seems the initial flashing isn't exactly the/an issue anymore, though the test case submitted from a duplicate filing simply shows that scrollbars still painting above content that it shouldn't be.

https://bug-96825-attachments.webkit.org/attachment.cgi?id=164226

I'm on 10.12.6 with safari 12.0.2 in the test case when scrolling the red container, it's scrollbar shows above the green element which is "stacked" above the red container.

I'm guessing the shortcut that was taken is something that is bypassed on iOS with the use of `-webkit-overflow-scrolling: touch` compositing in a different way than desktop???

>From what I've seen blink has remedied this issue for mac.
And gecko *only has this issue on mac *if stacking context places content above with use of implicit/initial `z-index` value of `auto`, but works well when explicitly setting `z-index`.

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