[Webkit-unassigned] [Bug 240183] New: CSS overscroll-behavior-x: contain does not disable history navigation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240183

            Bug ID: 240183
           Summary: CSS overscroll-behavior-x: contain does not disable
                    history navigation
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sime.vidas at gmail.com

Steps to reproduce: 

1. In desktop Safari, go to this page https://codepen.io/simevidas/full/BaYogWw
2. Use the trackpad two-finger-swipe gesture on the image carousel

What happened:

When you’re on the left-most image and swipe to the right, Safari will perform a back navigation. 

What should have happened:

The image scroll container has CSS `overscroll-behavior-x: contain`, so overscroll history navigation should be disabled while the mouse cursor is on top of it. Chrome and Firefox on macOS respect this. Safari doesn’t.

Additional notes:

I opened this bug because WebKit changeset 291497 [1] suggests that Safari’s behavior is on purpose. If that’s the case, could you explain why you don’t want websites to be able to disable overscroll history navigation via the CSS property? As my demo shows, there are legitimate use-cases for doing this.

[1]: https://trac.webkit.org/changeset/291497/webkit/

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