Hypertext Markup Language (HTML) 5 changes the situation by introducing the elements audio and video. HTML5-compliant browsers have built-in support for playing audio rather than relying on third-party plug-ins. The video and audio tracks in a container are delivered with well-established compression methods. A video player must decompress the tracks before playing the data. Webm is a new media container designed for the Web and is recommended for use with the audio and video elements of HTML. A video file for the Web usually supplies video tracks, audio tracks, and metadata. Digital audio and video files are encoded and compressed using a variety of different schemes. Standard video formats include webm, ogv, and mp4. The HTML5 audio and video elements make it easy to include media files in browser supported formats without the need for third-party plug-ins. HTML uses the much more complete Universal Character Set, or Unicode1 character set, defined in ISO10646.