And yet they're converging to implementing all of it.
The site you cite is meant specifically to show how Apple is doing with their HTML5 implementation.
Then it's a Safari demo, not an HTML5 demo. The Microsoft demos use HTML5 and yet work just fine in other browsers.
Those sites were generally presenting information that was useful to people regardless of which browser they were using.
How is seeing HTML5 working in Firefox or Chrome not useful to people?
Correct, which is probably why Apple says: "The demos below show how the latest version of Apple’s Safari web browser, new Macs, and new Apple mobile devices all support the capabilities of HTML5, CSS3, and JavaScript".
And yet they're converging to implementing all of it.
The site you cite is meant specifically to show how Apple is doing with their HTML5 implementation.
Then it's a Safari demo, not an HTML5 demo. The Microsoft demos use HTML5 and yet work just fine in other browsers.
Those sites were generally presenting information that was useful to people regardless of which browser they were using.
How is seeing HTML5 working in Firefox or Chrome not useful to people?