you mean the Javascript expression editor, or just the API docs? The Expression editor uses an old dump of the Mozilla docs (scraped). At that time I've been really surprised how little documentation for JS and others exists for offline usage or simple integration in an app. It got actually worse over time. However, here the link https://raw.githubusercontent.com/gbaumgart/xide/master/widg... (2 MB). The API docs are done with jsDoc-3 and "ink-docstrap"