@Kee Ellis I have thought of this myself, and while entering an actual password may not be possible, you can fake it and make it seem as though a password was autofilled. Check out Level 74 to see it in action.
Yeah, I get that. I wanted to do a passworded section of a page with a clue that the reader could figure out and determine the password from; it was going to be really cool, but it just doesn't look possible unless I learn how to implement Javascript on the wiki.