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<html><body><video width="320" height="240" controls> <source id="mySource" src="movie.mp4" type="video/mp4" media="screen and (min-width:320px)"> <source src="movie.ogg" type="video/ogg" media="screen and (min-width:320px)">Your browser does not support the video tag.</video><p>Click the button to return the value of the media attribute of the media resource.</p><p id="demo"></p><button onclick="myFunction()">Try it</button><script>function myFunction() { var x = document.getElementById("mySource").media; document.getElementById("demo").innerHTML = x;}</script></body></html>