xxxxxxxxxx<html> <body> <h1>Allow Attribute Example for Iframe permitting fullscreen</h1> <iframe width="560" height="315" src="https://www.youtube.com/embed/oFDeNcu3mnc?mute=1" title="YouTube video player fullscreen example" frameborder="0" allow="fullscreen" ></iframe> <p> <i> <strong>Note:</strong> If the iframe is located in another iframe (like our code editor) then you will need to ensure that the parent iframe also allows fullscreen.</i > </p> </body></html>