This is an opt-in trial of HTML5 video on YouTube. If you are using a supported browser, you can choose to use the HTML5 player instead of the Flash player for most videos. Your comments will help us improve and perfect the mixtures we're working on. So jump in, play around, and send your feedback directly to the brains behind the scenes.
Supported Browsers
We support browsers that support both the video tag in HTML5 and either the h.264 video codec or the WebM format (with VP8 codec). These include:
Microsoft Internet Explorer 6, 7, or 8 with Google Chrome Frame installed (Get Google Chrome Frame)
Notes
Fullscreen support is partially implemented. Pressing the fullscreen button will expand the player to fill your browser. If your browser supports a fullscreen option, you can then use that to truly fill the screen
The HTML5 player has a badge in the control bar. If you don't see the "HTML5" icon in the control bar, you've been directed to the Flash player (due to restrictions listed below)
The HTML5 player also has a badge to indicate the video is using the WebM format. If you don't see the "WebM" icon, the video is encoded using h.264
If you want to find videos with WebM formats available, you can use the Advanced Search options to look for them (or just add &webm=1 to any search URL)
Additional Restrictions (we are working on these!)
Videos with ads are not supported (they will play in the Flash player)
On Firefox and Opera, only videos with WebM transcodes will play in HTML5
If you've opted in to other testtube experiments, you may not get the HTML5 player (Feather is supported, though)
Your account has received the following Community Guidelines warning strikes, which will expire in six months. Additional violations may result in the temporary disabling of your ability to post content to YouTube and/or the termination of your account.
For your reference, a copy of each warning message has also been emailed to the address associated with this account.