Bug 304489

Summary:

`scrollTo(0, 0)` has no effect when scroll position is within bounds of sticky element

Product:

WebKit

Reporter:

Oliver Joseph Ash <oliverjash>

Component:

Scrolling

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

bramus, simon.fraser, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari 26

Hardware:

iPhone / iPad

OS:

iOS 26

Attachments:

Description	Flags
Video demonstrating the issue	none
macOS Safari for comparison (works as expected)	none

Oliver Joseph Ash

Reported 2025-12-19 02:50:56 PST

Created attachment 477789 [details] Video demonstrating the issue It appears `window.scrollTo(0, 0)` does not work in iOS Safari when the current scroll position is within the bounds of a sticky element. Reduced test case: https://cdpn.io/pen/debug/QwNexwR?authentication_hash=jVMpoPjEWPok Code: https://codepen.io/OliverJAsh/pen/QwNexwR In the attached video I'm first clicking on the button to scroll the content a bit so it appears below the sticky nav (`window.scrollTo(0, 50)`), then clicking the button to scroll to the top (`window.scrollTo(0, 0)`). The `window.scrollTo(0, 0)` call has no affect in iOS Safari. It does appear to be working in macOS Safari, as well as other browsers like Chrome.

Attachments
Video demonstrating the issue (9.87 MB, video/mp4) 2025-12-19 02:50 PST, Oliver Joseph Ash	no flags	Details
macOS Safari for comparison (works as expected) (307.85 KB, video/quicktime) 2025-12-19 02:51 PST, Oliver Joseph Ash	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Oliver Joseph Ash

Comment 1 2025-12-19 02:51:47 PST

Created attachment 477790 [details] macOS Safari for comparison (works as expected)

Radar WebKit Bug Importer

Comment 2 2025-12-19 10:52:18 PST

<rdar://problem/166892279>

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