This player is not enabled for HTML5 delivery on iPad 2

I try to load a video from fox.com website using safari on my iPad 2 with iOS 5, I get the error message "We're sorry. This player is not enabled for HTML5 delivery." I also get the same responses on other sites. How can I enable html5 to view videos on iPad?The HTML5 videos and games are working on the iPad. That message means that the web site you are visiting does not support HTML5 or doesn't