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<!DOCTYPE html> <html> <body> <video id="myVideo" width="320" height="240"> <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="enableControls()" type="button">Enable controls</button> <button onclick="disableControls()" type="button">Disable controls</button> <button onclick="checkControls()" type="button">Check controls status</button> <script> var x = document.getElementById("myVideo"); function enableControls() { x.controls = true; x.load(); } function disableControls() { x.controls = false; x.load(); } function checkControls() { alert(x.controls); } </script> </body> </html>