[Webkit-unassigned] [Bug 262628] New: WebGL: context lost - iOS 17 Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262628

            Bug ID: 262628
           Summary: WebGL: context lost - iOS 17 Safari
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: travis at lilsnack.co
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

We have a very lightweight Unity game that we've been running pretty successfully on mobile web. That said, we've just run into a pretty show-stopping issue with iOS 17 Safari. The game will work totally fine on iOS 17 Safari - but then after some combination of backgrounding, using other sites and other apps (not totally sure the exact repo) - it errors with:

"WebGL: context lost"

At this point, no matter how many times I refresh, I will always get this error. Force quitting browser and event resetting the device doesn't seem to recover it. I've also tried to do different combos of compressed builds - and nothing seems to work. The one thing that does recover is clearing the safari cache. We never encountered this issue in Safari 16 - only 17. 

It seems like this might be an issue beyond Unity - see this thread. Apparently threejs is experiencing the same: https://developer.apple.com/forums/thread/737042

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