browser.js

Pull down the official WHATWG / ECMA-262 specifications when implementing or modifying any web platform or JavaScript language feature. Use whenever touching DOM, HTML, Fetch, URL, Streams, Encoding, XHR, WebSockets, Service Workers, Web APIs, or JS language semantics (objects, promises, iterators, modules, etc.) — before writing or changing the implementation, fetch the relevant spec section and follow its algorithm step-by-step.