[Webkit-unassigned] [Bug 276016] New: Web Audio sounds stop playing after losing focus of safari in iOS 17.5.1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=276016

            Bug ID: 276016
           Summary: Web Audio sounds stop playing after losing focus of
                    safari in iOS 17.5.1
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: condeagustin at hotmail.com
                CC: cdumez at apple.com

After upgrading to iOS 17.5.1 (in any iOS device), when losing and then gaining focus of safari, any web audio sound that was playing (before losing focus) is off for the rest of the session. Even if you tap on a UI element that is supposed to produce a sound, the sound never comes back. This issue is 100% reproducible only on iOS 17.5.1. In the previous iOS version (e.g. 17.4.1) I tested it and this issue never happened

You can use the following web audio sample to repro the issue from safari iOS 17.5.1 (taken from the official web audio context documentation https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/resume):

1. Open https://mdn.github.io/webaudio-examples/audiocontext-states/ from iOS 17.5.1 safari
2. Tap on the "create context" button. You hear a constant sound
3. Lose focus of safari (e.g. minimize it) and the sound stops playing
4. Gain focus of safari and you will see that the sound is never heard again. In a previous iOS version (or in any other non-iOS browser), such sound keeps playing just fine after losing focus. For some reason, iOS 17.5.1 breaks the web audio context when you lose focus, and the only way to hear sounds again is to create a new instance of web audio context every time you gain focus

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