Oh wow, MDN has been a game changer in documentation IMO. I'm glad to see it starting to show up higher than w3schools for more and more searches (w3schools' page rank is so high since they've been around for forever).
w3schools is where I've gotten most of my DOM/HTML information as a non-web (for the most part) developer - simply because it does show up first in searches. I'd never heard of MDN until now, but it looks really good. I'll definitely look there next time I need to know something.
Thanks for writing!