[Webkit-unassigned] [Bug 255134] New: AudioContext stops playing when displaying a dialog (window.alert() or window.confirm())

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255134

            Bug ID: 255134
           Summary: AudioContext stops playing when displaying a dialog
                    (window.alert() or window.confirm())
           Product: WebKit
           Version: Safari 16
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simmkyu at amazon.com
                CC: cdumez at apple.com

Problem:
- AudioContext stops playing when displaying a dialog (`window.alert()` or `window.confirm()`)

Steps to Reproduce:
1. Open any website in macOS or iOS Safari. (For iOS Safari steps, unmute your device.)
2. Run the following script in Safari's console. The script adds a button to play a tone and show a dialog.
  ```
  (() => {
    const button = document.createElement('button');
    button.innerText = 'Play audio';
    button.style = 'position: fixed; top:0; left:0; z-index:9999';
    document.body.appendChild(button);

    let isPlaying = false;
    button.addEventListener('click', async () => {
      if (isPlaying) {
        window.alert('Alert!');
      } else {
        isPlaying = true;
        button.innerText = 'Call window.alert';
        const audioContext = new (window.AudioContext || window.webkitAudioContext)();
        const oscillator = audioContext.createOscillator();
        oscillator.type = 'square';
        oscillator.frequency.setValueAtTime(440, audioContext.currentTime); // value in hertz
        oscillator.connect(audioContext.destination);
        oscillator.start();
      }
    });
  })();
  ```
3. Click the "Play audio" button at the top-left corner of the website. You should hear a tone from Safari.
4. Click the "Call window.alert" button.

Actual Results:
- The tone cannot be heard as the dialog appears.

Expected Results:
- The tone should continue playing after the dialog appears or when the dialog is dismissed.

Test Environments:
- macOS Safari 16.4
- iOS Safari 16.3

Additional Information:
- In macOS Chrome 111, the audio continues to play without any pauses.
- In macOS Firefox 111, the audio stops while the dialog is visible, but resumes playing after the dialog is closed.

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