The available quality rates will player be displayed in h.264 a cool way so you can select the desired quality for the playing video. When youtube videos mp4 are used the poster is disabled / hidden fullscreen & the large play button is only available after the video starts playing. For example if this jquery feature is set to stop all instances fallback track will stop & interrupt the download process this way the page will not load more then one video at the time. It only requires autoplay the mp4 format (the best & most used format on the web) & it will work on mobile devices & desktop machines