So does all HTML5 video, it just doesn&#x27;t show the controls.<p>Here&#x27;s my bookmarklet (doesn&#x27;t work on embedded videos in iframes, I assume because of same-origin-policy)<p>javascript:void%20function(){document.querySelector(%22video%22).playbackRate=parseFloat(prompt(%22Set%20the%20playback%20rate%22))}();