[Webkit-unassigned] [Bug 243107] New: Safari re-snapping repetedly on Twitter timeline after adding scroll snap user styles

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243107

            Bug ID: 243107
           Summary: Safari re-snapping repetedly on Twitter timeline after
                    adding scroll snap user styles
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            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. Open https://twitter.com/home
2. Run the following code in the JS console to inject scroll snap user styles to page:

    document.body.insertAdjacentHTML(
    "beforeend",
    `
    <style>
    html {
        scroll-snap-type: y proximity !important;
    }

    article {
        scroll-snap-align: start !important;
    }

    [aria-label="Home timeline"] > :first-child {
        position: static !important;
        scroll-snap-align: start !important;
    }

    [aria-label="New Tweets are available."] {
        display: none !important;
    }
    </style>
    `
    );

3. Start scrolling the page down repeatedly.

What happened?

At certain points, Safari will start re-snapping different tweets to the top while the user is doing nothing.

I have recorded a video of the issue: https://www.youtube.com/watch?v=i99ADUX9uak

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