> The promise of LaTeX is that documents could be defined strictly in semantic terms, though my belief is that this would last for approximately 37.229 minutes after such a proposal actually hit the Web.

I mean, that already failed for LaTeX. To me it's kind of an unwieldy pile of wierd imperative imports. I did write my thesis in it, but for the most part it was "smash these imports together, pray for the best, if it doesn't work, try a different collection of imports, don't bother trying to fix your imports, settle for "least bad" -- which, of course, was better than MS word". I used to do my resumes too, with the same spray and pray feel. Now I just write a markdown file, and anyone that cares that the resume is poorly formatted I probably don't care to work for (many places sanitize resumes to a single format anyways, i suppose for non-discrimination purposes).

Honestly, even though I myself can't use CSS effectively, what little bit I can use feels like CSS is converging to that declarative-layout-that-is-separate-from-document-contents philosophy that LaTeX tried to do, with the major distinguishing point that LaTeX had a huge "start with sane defaults" selling point, and CSS most definitely does not start with sane defaults.