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<!DOCTYPE html> <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>