WebM video files play directly in your web browser using a new technology called HTML5. WebM is an open source web video format. It is released by

Google. Since the WebM project launch, YouTube has been encoding videos uploaded at 720p or higher resolution in the WebM format. This format will not support in all web browser. You must install a web browser which supports WebM files

1. Download and install Opera 10.6 web browser that supports WebM files. (http://www.opera.com/browser/)
2. Then start the newly installed browser
3. Go to www.youtube.com/html5 and enroll in the YouTube HTML5 experiment
4. Note that this sets a cookie with a relatively short expiration, so you may need to re-enroll in the future
5. Next search for a video by keyword
6. Then the search results will come
7. Click the Search options link to expand the options menuIn the Features column
8. Click WebM to limit the search results to WebM-format video

Note that Internet Explorer 9 with plugin, Google Chrome 6 are also supported the WebM files