We need more single page references like this, IMO, for all sorts of random domains. Even something like a single-page reference for how Array.from works in JS,

We need more single page references like this, IMO, for all sorts of random domains. Even something like a single-page reference for how Array.from works in JS, as an example. Even if it were standalone it could later be integrated into a broader reference work. In the meantime, a "arrayfrom.dev" page, although non-general, would fill a specific niche w/ a mnemonic URL (Array.from is just an example - no idea whether or not it would be considerable in this regard). Other "pages" (as rough-sketch descriptions) I can imagine: colors.dev, cacheperf.dev, unicode.dev, rdf/microdata.dev, parsing.algorithms.dev, querystring.dev (a micro reference for sure). Likewise, "micro" web tools which I'm sure exist as a concept I don't know already would be very convenient (xml->json converter, linters/viewers/auditors of all sorts).