Bug 226354

Summary:

VisualViewport fires lots scroll events for 0.5px offsets when scrolling on Retina iOS device

Product:

WebKit

Reporter:

Simon Fraser (smfr) <simon.fraser>

Component:

DOM

Assignee:

Nobody <webkit-unassigned>

Status:

NEW ---

Severity:

Normal

CC:

john.crim, simon.fraser, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari Technology Preview

Hardware:

Unspecified

OS:

Unspecified

See Also:

https://bugs.webkit.org/show_bug.cgi?id=218465

Attachments:

Description	Flags
Testcase	none

Description Simon Fraser (smfr) 2021-05-27 13:38:39 PDT

Created attachment 429921 [details]
Testcase

When not zoomed, we should not be firing scroll events on the VisualViewport. However, we do, because of some 0.5px difference between the layout viewport and visual viewport, probably due to rounding. See testcase, test on iPad.

Comment 1 Radar WebKit Bug Importer 2021-05-27 13:38:58 PDT

<rdar://problem/78584763>

Comment 2 Simon Fraser (smfr) 2021-05-27 13:39:21 PDT

We also fire events on rubberbanding.