HTML5 Services, HTML 5 Experts, HTML5 Development Services and Developers at Snovasys.com HTML5 is the next major revision of the HTML standard superseding HTML 4.01, XHTML 1.0. HTML5 is a cooperation between the World Wide Web Consortium (W3C) and the Web Hypertext Application Technology Working Group (WHATWG).The new standard incorporates features like video playback and drag-and-drop that have been previously dependent on third-party browser plug-ins such as Adobe Flash, Microsoft Silverlight, and Google.