[Webkit-unassigned] [Bug 234256] New: window.screenY is always 0 on mobile devices

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234256

            Bug ID: 234256
           Summary: window.screenY is always 0 on mobile devices
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aideen at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

window.screenY (https://developer.mozilla.org/en-US/docs/Web/API/Window/screenY) is supposed to return the vertical distance, in CSS pixels, of the top border of the user's browser viewport to the top edge of the screen.

On mobile devices (Chrome 96 on Android and iOS + Safari on iOS) it always returns 0.  Firefox (Gecko) on Android, however, returns a non-zero value (53 in my case) which is properly the height of the addressbar and other things between the top of the window and top of the screen.

PS. I can get this by subtracting event.clientY and event.screenY on touch/click events.  But I want it on non-event contexts as well.

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