Videos don't have to slow down your site, as long as we pay attention to the details. Using the HTML5 video element however is not enough when handling video embed code that uses iframes and objects tags. We have applied four simple optimisations to a landing page hero video, removing a layout shift and improving the render time for the video from six seconds to three on a 3G connection. You could also add a play button in this context, so users could opt-in to the video if they would like to see it. However, muted autoplay is always allowed.
Try it Yourself Note: Chromium browsers do not allow autoplay in most cases. addEventListener ( "load", function ( ) Mbps) - not showing video ` )
addEventListener ( "load", function ( ) Mbps) - not showing video ` ) 
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