[Webkit-unassigned] [Bug 221240] New: Applying scroll-snap-type resets scroll position to 0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221240

            Bug ID: 221240
           Summary: Applying scroll-snap-type resets scroll position to 0
           Product: WebKit
           Version: Safari 14
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkitbugs at philipf5.dev

Created attachment 418951

  --> https://bugs.webkit.org/attachment.cgi?id=418951&action=review

Minimal code reproduction

I've come across what I *believe* is a bug in Safari (both macOS and iOS) with the scroll-snap-type CSS property. If I apply a scroll-snap-type property using JavaScript to an element that didn't already have it, the element's scroll position resets to 0. This contrasts with Chromium, in which the element's scroll position just jumps to the nearest snap point, which seems to be the more logical behavior.

This may be related to bug #214232 in some way, but this issue seemed slightly different (as acknowledged by a comment on that bug) and easier to reproduce, so I thought maybe it should be filed separately. I've attached a minimal code reproduction. The seemingly bugged behavior occurs for me in Safari 13, 14, and TP.

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