Using the volume property to set the volume:
document.getElementById("myVideo").volume = 0.2;
Change the volume by either clicking the buttons or by adjusting the volume in the bottom right corner.
<!DOCTYPE html> <html> <body> <video id="myVideo" width="100" height="100" controls> <source src="video.mp4" type="video/mp4"> <source src="video.ogg" type="video/ogg"> Your browser does not support the video tag. </video>/*from w w w .j a va2s . c o m*/ <button onclick="setHalfVolume()" type="button">Set volume to 0.2</button> <button onclick="setFullVolume()" type="button">Set volume to 1.0</button> <p id="demo"></p> <script> // Get the video element with id="myVideo" var x = document.getElementById("myVideo"); // Attach a "volumechange" event to the video x.addEventListener("volumechange", getVolume); function getVolume() { document.getElementById("demo").innerHTML = "The audio volume is: " + x.volume; } // Set the audio volume to 0.2 function setHalfVolume() { x.volume = 0.2; } // Set the audio volume to 1.0 (the highest) function setFullVolume() { x.volume = 1.0; } </script> </body> </html>