Use the onprogress attribute to execute a script when the browser is in the process of getting the media data in HTML.
Example
You can try to run the following code to implement onprogress attribute −
<!DOCTYPE html> <html> <body> <video id = "myVideo" width = "320" height = "176" controls onprogress = "display()"> <source src = "/html5/foo.ogg" type = "video/ogg" /> <source src = "/html5/foo.mp4" type = "video/mp4" /> Your browser does not support HTML5 video. </video> <script> function display() { alert("Started"); } </script> </body> </html>