One of the more exciting developments in HTML5 video is the inclusion of the track element in the newest versions of the desktop browsers. In addition to bringing captioning and subtitle support to HTML5 video, the invisible track element allows publishers to attach a rich array of textual metadata to their videos. In this blog post, we'll look at the different types of tracks that can be used in conjunction with the <video> tag.
Before proceeding any further, lets look at one of its flaws. The track element is extremely new, and browser support is growing, but limited. The current version of Chrome supports it, but the functionality must be enabled via a configuration option. Internet Explorer 10, which is available in the Windows 8 developer preview, also has a working implementation. Mozilla is working on it for Firefox, but no timetable has been given for when it will be complete.
This blog also exchange views on a new standard, called WebVTT (Web Video Text Tracks), developed by the web standards community. It provides a simple, extensible, and human-readable format on which to build text tracks.
To read the complete blog post visit: http://www.longtailvideo.com/blog/27621/whats-new-in-html5-the-track-element