[Webkit-unassigned] [Bug 227580] New: Full page scroll snap breaks in iOS Safari 15

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227580

            Bug ID: 227580
           Summary: Full page scroll snap breaks in iOS Safari 15
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: johannes.odland at nrk.no
                CC: simon.fraser at apple.com

Created attachment 432677

  --> https://bugs.webkit.org/attachment.cgi?id=432677&action=review

Movie showing page snapping back to first snap target

Detected in Safari iOS 15 simulator

How to reproduce:

1. Go to a page with `html {scroll-snap-type: y mandatory;}` and snap target elements sized in vh, such as this codepen: https://codepen.io/johannesodland/pen/zYwGvXx
2. Try to scroll down

Expected result:
Page snaps to next scroll target element

Actual result:
Page snaps back to first target element


The bug might be caused by vh units updating as the user scrolls in iOS 15.

This works fine in 14.5

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