He explains this here: http://www.crockford.com/javascript/encyclopedia/preface.htm...

(In summary, it's a started work but not finished, and he's hoping people will step in to help him finish it).

I do wonder how useful this going to prove, given Mozilla's already excellent reference material (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...).

I think Douglas never got around to writing those sections, or maybe he thought they were self-explanatory. Who knows?