YouTube recently updated its page on HTML 5 , now offering users to testdrive HTML 5. HTML 5 is the next version of HTML ( HyperText Markup Language).

The HTML5 editors are Ian Hickson of Google, Inc. and David Hyatt of Apple, Inc.

HTML 5 is an alternative to Flash or Silverlight and is believed to be much more secure and stable than them.

HTML 5 is right now in BETA version and you could opt for it by heading your browser in this direction. You could now opt in for HTML 5 and try out the videos . The only drawback being that yet watching YouTube videos in full screen mode in not supported. Though that can be obtained on Firefox by using an addon.

HTML 5 evolves HTML and its related APIs to ease the authoring of Web-based applications.