html5 youtube google chrome

Avi Greenbury avismailinglistaccount at
Wed Feb 3 08:18:42 UTC 2010

Karl F. Larsen wrote:
> 	Thanks and I see where the money is pointing. Google can 
> really make waves when they want to. But I read part of the 
> html5 definition and it said it must be backward compatable, 
> but this often is forgot.

Unfortunately, it's mostly impossible to develop a markup language for
page structure in a backwards-compatible way. If you define new
structures, old user agents will not understand them. There's no real
way round that.

The backwards-compatibility in HTML5 refers more to it being an
extension of XHTML1 - you could replace the doctype on a a valid
XHTML1.0 document with an HTML5 one and it will check out as valid
HTML5. This means that HTML5 user agents should have no problems
rendering XHTML content, without explicitly supporting it.

Avi Greenbury ;)

More information about the ubuntu-users mailing list