[Webkit-unassigned] [Bug 253816] New: Page blocked when click wheel(middle) button

Mon Mar 13 04:06:57 PDT 2023

https://bugs.webkit.org/show_bug.cgi?id=253816

            Bug ID: 253816
           Summary: Page blocked when click wheel(middle) button
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Windows 10
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dean.xu at asml.com

For following case, drag scroll thumb (the green block) can scroll as normal.
But if you click the wheel(middle) button, the whole page is blocked, even after reload or switch page.

```html
<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        main {
            overflow: auto;
            scrollbar-gutter: stable;
        }

        div {
            background: linear-gradient(90deg, blue, red);
            width: 4000px;
            height: 100px;
        }

        main::-webkit-scrollbar {
            width: 16px;
            background-color: black;
        }

        main::-webkit-scrollbar-thumb {
            background: green;
        }
    </style>
    <title>Scroll Gutter Bug</title>
</head>
<body>
<main>
    <div>

    </div>
</main>
</body>
</html>
```

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