Bug 199779 - Don't do async overflow scrolling for visibility:hidden scrollers
Summary: Don't do async overflow scrolling for visibility:hidden scrollers
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: Scrolling (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Simon Fraser (smfr)
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2019-07-13 12:04 PDT by Simon Fraser (smfr)
Modified: 2019-07-13 15:40 PDT (History)
5 users (show)

See Also:

Attachments
Patch (8.02 KB, patch)
2019-07-13 13:46 PDT, Simon Fraser (smfr) 		dino: review+
Details | Formatted Diff | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Simon Fraser (smfr) 2019-07-13 12:04:27 PDT 
If a scroller has visibility:hidden, don't trigger the async overflow scroll code path.

Some JS libraries make visibility:hidden scrollers (https://github.com/wnr/element-resize-detector) and we need to avoid the compositing cost.

I filed https://github.com/w3c/csswg-drafts/issues/4113 on this not being well-defined in CSS, and expect that to be resolved in a way that prevents scrolling.
Comment 1 Radar WebKit Bug Importer 2019-07-13 12:05:11 PDT 
<rdar://problem/53056654>
Comment 2 Simon Fraser (smfr) 2019-07-13 13:46:03 PDT 
Created attachment 374081 [details]
Patch
Comment 3 Simon Fraser (smfr) 2019-07-13 15:34:57 PDT 
https://trac.webkit.org/changeset/247420/webkit