[whatwg] HTML5: compatible with all legacy Web browsers

[Erik Vorhes]

On Fri, Aug 7, 2009 at 8:28 AM, Aryeh Gregor<Simetrical+w3c at gmail.com> wrote:
> I think the meaning of "compatible with all existing browsers" here is
> that HTML 5 does not *require* authors to break compatibility with any
> existing browser.
>

I agree completely with your interpretation of the phrase. HTML5 is
intended to enhance the web without breaking it, so noting (or even
emphasizing) how it's backwards-compatible is important and useful.

But the phrase should be clarified along similar lines to what you've
articulated. Maybe: "HTML5 can be written in such a way that it is
compatible with all browsers made after X date"?

Erik