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<!DOCTYPE html> <html> <body> <video id="myVideo" width="320" height="240" controls> <source src="movie.mp4" type="video/mp4"> <source src="movie.ogg" type="video/ogg"> Your browser does not support the video tag. </video><br> <button onclick="getMuted()" type="button">Is the video muted by default?</button> <button onclick="setToMuted()" type="button">Set video to be muted by default, and reload video</button> <script> var x = document.getElementById("myVideo"); function getMuted() { alert(x.defaultMuted); } function setToMuted() { x.defaultMuted = true; x.load() } </script> </body> </html>