Bug 239437 - AX: macOS "Show scrollbar" setting "when scrolling" not respected, when a website sets scrollbar width
Summary: AX: macOS "Show scrollbar" setting "when scrolling" not respected, when a web...
Status: RESOLVED INVALID
Alias: None
Product: WebKit
Classification: Unclassified
Component: Accessibility (show other bugs)
Version: Safari 15
Hardware: Mac (Apple Silicon) macOS 10.15
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2022-04-17 12:16 PDT by Christoph
Modified: 2022-07-23 12:07 PDT (History)
4 users (show)

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Description Christoph 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`
Comment 1 Radar WebKit Bug Importer 2022-04-17 12:16:37 PDT 
<rdar://problem/91865092>
Comment 2 Smoley 2022-05-24 09:06:54 PDT 
Thanks for filing, link to or attach a test case that demonstrates the issue.
Comment 3 Smoley 2022-05-24 09:15:11 PDT 
Forgot to say please! Thanks again :)
Comment 4 Simon Fraser (smfr) 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.
Comment 5 Christoph 2022-07-23 10:29:39 PDT 
Whats the reasoning behind this decision, e.g. why disregard the users OS settings?
Comment 6 Simon Fraser (smfr) 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.