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<html><body><p>Click the buttons to create an AUDIO element, one with preload set to "none", and one with preload set to "auto".</p><button onclick="myFunction('none')">Audio without preload</button><button onclick="myFunction('auto')">Audio with preload</button><br><script>function myFunction(p) { var x = document.createElement("AUDIO"); x.setAttribute("controls", "controls"); var y = document.createElement("SOURCE"); y.setAttribute("src", "horse.ogg"); y.setAttribute("type", "audio/ogg"); x.appendChild(y); var z = document.createElement("SOURCE"); z.setAttribute("src", "horse.mp3"); z.setAttribute("type", "audio/mpeg"); x.appendChild(z); // Set the preload property: x.preload = p; document.body.appendChild(x);}</script></body></html>