RESOLVED INVALID239437
AX: macOS "Show scrollbar" setting "when scrolling" not respected, when a website sets scrollbar width 
https://bugs.webkit.org/show_bug.cgi?id=239437
Summary AX: macOS "Show scrollbar" setting "when scrolling" not respected, when a web...
Christoph
Reported 2022-04-17 12:16:29 PDT
The macOS "Show scrollbar" setting "when scrolling", which automatically hides scrollbars is not respected, when a website sets CSS scrollbar width via `::-webkit-scrollbar`
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Radar WebKit Bug Importer
Comment 1 2022-04-17 12:16:37 PDT
<rdar://problem/91865092>
Smoley
Comment 2 2022-05-24 09:06:54 PDT
Thanks for filing, link to or attach a test case that demonstrates the issue.
Smoley
Comment 3 2022-05-24 09:15:11 PDT
Forgot to say please! Thanks again :)
Simon Fraser (smfr)
Comment 4 2022-05-24 12:28:53 PDT
This is intended behavior. If the page provides custom scrollbars via `::-webkit-scrollbar` then they are always visible.
Christoph
Comment 5 2022-07-23 10:29:39 PDT
Whats the reasoning behind this decision, e.g. why disregard the users OS settings?
Simon Fraser (smfr)
Comment 6 2022-07-23 12:07:31 PDT
Because overlay scrollbars have some behaviors that are not describable via custom scrollbars (e.g. they grow on hover). In general, we'd like to deprecate custom scrollbars.
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