Black P.
Indispensable resource for documenting and driving the web
Mozilla and the MDN have been an indispensable resource for documenting and driving the web for as long as I can remember looking into web development. I've never felt lost trying to find documentation and figuring out where to look next (for things like inheritance chains, related concepts), like I so often have with Microsoft's disorganized docs on the "learn" network. If I ever need to look something up, I know I'll either find it here or I'm thinking about it wrong ;)