At Google I/O, Google launched “WebM,” an open web media format project and open-sourced VP8, a high-quality, web-optimized video codec, contributing the project under a royalty-free license. WebM includes: VP8; Vorbis, an already open source and broadly implemented audio codec; a container format based on a subset of the Matroska media container. A developer preview of WebM and VP8, including source code, specs, and encoding tools is available here. Industry leaders and web community members collaborating on the development of WebM and integrating it into their products includes: Mozilla, Opera, Google Chrome, Adobe, and many others below have to say about the importance of WebM to the future of web video. Microsoft also offered a lukewarm statement: "In its HTML5 support, IE9 will support playback of H.264 video as well as VP8 video when user has installed a VP8 codec on Windows," said Dean Hachamovitch.