Which is exactly what OP was complaining about. HTML documents need multiple files to work correctly. .DOC and .PDF provide this. There is no standard for HTML containters.
I believe that HTML is far more powerful than currently tapped.
Key term for this chapter is "than currently tapped". The problem is, .DOC and .PDF solve all the problems HTML documents have.
The take-home assignment is to make an HTML container that can be read and edited in software that everyone has, then convince the world (and hiring managers) that everyone should stop using Word even though it works perfectly fine. Extra credit if you make it as rich and feature filled as Word without making it more bloated than Word.
Yep, someone has to build a standard for HTML containers to contain documentary elements like Word/PDF have done so far.