There was an internet draft for HTML 1.0, but it has long since expired.
For 2.0, see there is a current draft, which is in the final
stages of becoming a standards track RFC. See:
"IETF - HyperText Markup Language (HTML) Working Group"
Also, keep an eye on the traditional HTML page:
I haven't updated it yet, but I will soon.
For 3.0, see (temporarily):
Note that Dave Ragget maintains that document, not me.