WebM is the popular open source video format in the web world and there are lots of videos are present on YouTube which are encoded by YouTube at 720p or in higher resolution format. If anyone wants to search for a WebM videos on YouTube then you can do easy custom search for this and you have to make/create shortcuts on Google Chrome, Firefox and Opera.
If you wish to find any YouTube Video is present in WebM Format then you just add &html5-True at the end of the video URL. Make sure that “True” must be capitalized. If there is a WebM video is present then it will open up the video instead of Flash version.
Just take a look on the example below Flash version will be looks like:
version will be looks like :
if you are unable to find out WebM videos then this problem may be occur due to the cookie issue in your browser. For this you have to perform HTML 5 beta test and you can do this test on the following link :
What actually will going to be happen after this test the enrollment in YouTube HTML 5 beta test will be stored in a browser cookie but not in your Google account or in YouTube. You must remember this thing in your mind that the cookie will be expire after some time so you need to reset the cookies again in-order to watch/view the WebM video format on YouTube.