As you obviously meant, no total general-purpose languages. I'm sure that HTML is total, for example. You also later qualified that "no total languages" meant "no widespread, simple, total languages", which I think is a very different statement!
It seems to me that your next sentence addresses this better than I could.
> that's not very interesting from the standpoint of totality: we already know that Web browsers are supposed to show something no matter how mangled their input is.
So isn't it interesting that they do that? I think that the prevalence of scripting languages on the modern web (and, if you like to look farther back in history, the reluctant Turing completeness of TeX) strongly suggests that it wasn't at all inevitable that we would get a total language for web design.
That is, to prove that it is total is presumably not much of an accomplishment, but that it is total is very interesting (and, from the point of view of the success of the web, important) indeed.
Edit: As far as HTML goes, I was attempting to describe "programming languages" - or perhaps algorithmic languages - which I don't consider HTML falling under.