[Webkit-unassigned] [Bug 244120] New: iOS 15.6 Some WebGL-enabled pages freeze when taking screenshots

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244120

            Bug ID: 244120
           Summary: iOS 15.6 Some WebGL-enabled pages freeze when taking
                    screenshots
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: alex at soft8soft.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

This issue is reproduced on iOS 15.6 for some Verge3D applications. E.g:

The app which crashes https://cdn.soft8soft.com/demo/blender/metaballs/metaballs.html
The app which does work https://cdn.soft8soft.com/demo/blender/spinner/spinner.html 

When taking screenshots using Side button + Volume up (iPhone 13+) or Side button + Home button (earlier iPhones) the browser freezes completely. The bug appears to be not connected with Verge3D specifically.

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