Vimeo also supports HTML5 video

YouTube isn’t the only one to play nice with HTML5, as Vimeo also ensures its library is compatible with HTML5 video. Bear in mind that HTML5 video will function in Safari and Chrome browsers only at point of publishing, although it might end up as a standard feature in other major browsers in due time. Why HTML5, you ask? Well, the Flash video standard doesn’t fare too well on Mac OS X and Linux, while it isn’t supported by several popular mobile devices. HTML5 saves the day by enabling the video itself to be natively rendered in the browser, similar in how JPEGs or GIFs are rendered currently, making it simpler and more efficient