It's annoying and useless IMO. Do we really need it? A link to the actual mdn page would be great, but just stating `MDN` seems pretty useless to me. If it's for licencing issues, 1. we could just make a licencing statement upfront, once, about comments and MDN. 2. descriptions of API aren't copyrightable anyway. Even API itself isn't copyright-able according to Google vs Oracle.