13 Mar 2019 The HTML5 video player supports three formats, but not all of them have the same level of browser support. This means you can add sources in  Is that all you really need to embed a video on your page? Generally Preload - Begins downloading the video as soon as the user hits the page. To preload Autoplay - This instructs the browser to begin playing the video as soon as the page loads. Our task is to They do not play smoothly when a file is not fully loaded. 3 Aug 2010 . That's all you need to embed a simple video on your page and the optional type attribute to help decide which file to download and play. if not, it will check if it can play MPEG-4 videos with the avc1.42E01E In some cases, the browser won't play the video if the MIME type isn't set properly. If the browser supports WebM , it plays chrome.webm; if not, it checks whether the browser can select a video source without having to download part of the video to "sniff" the format.