The HTML 5 is the next standard in Hypertext Markup for the web. This file uses some of the features in that new standard.

Mozilla 3.0, which is supported in this release of Ubuntu ( 8.10 ) is downrev from the latest 3.10, which does support more of the HTML5 standard and is available in the later versions of that OS.

Although Mozilla 3.6 was available it was not yet supported. It was not clear that I could install it along side this version to test, so rather than losing mozilla altogether I decided not to install it.