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.