When playing audio via an HTMLAudioElement instance and the src is a Blob URL, playback halts before the end of the track and the "ended" event is never fired on the audio element. Steps to Reproduce: Please see the jsfiddle link for a demo: https://jsfiddle.net/1yv7b82n/5/ 1. Fetch an mp3 or other audio file and read the response body as a Blob 2. Get an object URL from the blob then set that URL as the src of an audio element 3. Call play() on the audio element Expected: The audio plays all the way through, and the onended event is fired after playback completes. Actual: Playback never completes and onended is never fired. In the example provided in the jsfiddle above, I observed playback ceasing several seconds before the actual end of the audio. I also notice my phone heating up after audio ends so maybe there is runaway CPU/memory usage somewhere. Build Date & Hardware: Safari on iOS 15.4 stable. Does not occur on Safari 15.4 (17613.1.17.1.6) on MacOS.