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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>onended — dynamic assignment</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}audio{display:block;max-width:100%;margin-bottom:.75rem}.log{padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>audio.onended</h1>

  <p>Set the handler after the element exists — play to the end to trigger it.</p>

  <audio id=dynamicAudio controls>

    <source src=/audio/count.mp3 type=audio/mpeg>

    Your browser does not support audio.

  </audio>

  <div class=log id=log>Play the audio to the end…</div>



  <script>var audio=document.getElementById("dynamicAudio"),log=document.getElementById("log");audio.onended=function(){log.innerHTML="<strong>Dynamic handler:</strong> playback finished!"}</script>

</body>

</html>

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HTML onended Attribute — Dynamic Property Assignment