[Webkit-unassigned] [Bug 253110] New: Scroll jumps to an incorrect position if the user taps the viewporr before scroll-snapping is complete

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Feb 28 14:17:39 PST 2023


https://bugs.webkit.org/show_bug.cgi?id=253110

            Bug ID: 253110
           Summary: Scroll jumps to an incorrect position if the user taps
                    the viewporr before scroll-snapping is complete
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zouhir at google.com
                CC: simon.fraser at apple.com

Repro steps:

1- Go to https://scroll-snap-demo.web.app/
2- Scroll past the results (~3500px on iPhone XR)
  2.a- When you reach colorful sections, you should start noticing CSS scroll snap points.
3- Scroll to go to next colorful section.
4- Before scroll snap is complete, *tap* anywhere on the screen.

Actual Behavior on Safari 16 in iOS:
- Tapping interrupts scroll snapping, and causes scrolling to jump, restoring the original position before any scrolling happened.

Expected behavior:
- Tapping should not cause any scrolling position to change

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