[Webkit-unassigned] [Bug 242312] New: requestAnimationFrame is not called after a certain WKWebView magnification

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242312

            Bug ID: 242312
           Summary: requestAnimationFrame is not called after a certain
                    WKWebView magnification
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: felix at antetype.com
                CC: kkinnunen at apple.com

Created attachment 460651

  --> https://bugs.webkit.org/attachment.cgi?id=460651&action=review

Xcode project showing the issue

In our application (MacOS-application using WKWebView), we have an issue where after a certain magnification requestAnimationFrame-handlers are not called anymore (or very very rarely). 

I tried to strip down the issue and was able to reproduce it in a simple Cocoa-Application using a WKWebView which displays a web page. 

Steps to reproduce:

* build and open the attached Xcode project
* you see some elements and a red cell with an updating number in it 
* Click on the "zoom in"-button (and make sure you see the updating number)
* Starting from a magnification of 3 (you can see the magnification in the lower right corner) the number stops updating
* zoom out again and it starts again. 


the requestAnimationFrame handler is set in the viewer.html. If I use a simpler web page (only a one html with the same, or using a iframe it works as expected).

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