244120 2022-08-19 04:54:54 -0700 iOS 15.6 Some WebGL-enabled pages freeze when taking screenshots 2022-08-19 09:26:08 -0700 1 1 1 Unclassified WebKit WebGL Safari 15 iPhone / iPad iOS 15 RESOLVED CONFIGURATION CHANGED InRadar, Regression P2 Major --- 1 alex webkit-unassigned dino kbr kkinnunen simon.fraser webkit-bug-importer oldest_to_newest 1892394 0 alex 2022-08-19 04:54:54 -0700 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. 1892419 1 gsnedders 2022-08-19 09:15:03 -0700 Looking at the stacks, seems kinda similar to bug 237674, insofar as the UI process is blocked on -[_WKWebViewPrintFormatter drawInRect:forPageAtIndex:] + 116 (_WKWebViewPrintFormatter.mm:95). 1892420 2 webkit-bug-importer 2022-08-19 09:15:17 -0700 <rdar://problem/98885447> 1892427 3 gsnedders 2022-08-19 09:26:08 -0700 Far as I can tell, this doesn't reproduce on iOS 16 Beta, so I'm assuming this was fixed elsewhere.