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browsers require user interaction before they will play audio

Not associated with Microsoft. Firefox 66 to block automatically playing audible video and audio rev2023.4.21.43403. To address @rachel-fenichel's comment, there could be a file with dummy sounds (say 10-20ms) that could be used for testing codec support that should also be relatively lightweight. You should always look at the Promise returned by the play function to see if it was rejected: Don't play interstitial ads without showing any media controls as they may not autoplay and users will have no way of starting playback. Cross-browser audio basics - Developer guides | MDN audio auto play next song when previous is finished, Play audio and duck music thats playing in the background in Flutter. If this is false, the allowedToPlay property is missing from the HTMLMediaElement interface, and is thus not present on either