Re: Is "breaking the Web" with HTML 5 a non issue?

Justin James wrote:
> I was reading over the discussion around the <applet> element, and I asked
> myself, "what difference does it make if we break the applet tag? After all,
> a page has to be deliberately changed in order to claim that it is HTML 5
> (via DOCTYPE), so it is not like we are actually breaking any existing
> content."

HTML 5 user-agents will handle all text/html content as HTML 5 says, 
regardless of whether it's marked as such or not.  As a result, breaking 
existing content is a massive concern.

a.