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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> <p>Click the button to get the exact length (duration) of the video, in seconds.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myVideo").duration; document.getElementById("demo").innerHTML = x; } </script> </body> </html>