This document contains an official Steering Group-maintained accounting of the WHATWG workstreams, their responsible editors, and their associated standards.
Note that per the Workstream Policy, the official Editors listed here may have delegated responsibilities and editing duties to deputy editors for any given Living Standard. As such, the Editor position listed here is more about "who is the official liaison with the Steering Group" and less about "who is editing the document". To get an accounting of who is primarily responsible for day-to-day specification work, you'll be better served by checking the Acknowledgments section of the Living Standard in question.
Compatibility
Scope
CSS properties and DOM APIs that web browsers need to support for compatibility with the de facto web.
A kitchen sink full of technologies for the web, including the core markup language for the web, HTML, as well as numerous APIs like Web Sockets, Web Workers, localStorage, etc.