Coverage / resize-observer

Resize Observer

Specification: drafts.csswg.org/resize-observer-1/. 3 interfaces defined here, 10 members exposed on Window (Web IDL). Group: Test DOM core.

Existence only: “present” means the name is defined where Web IDL puts it, not that it behaves as the standard says. The featured checks test behavior.

Probed 2026-10-19. Data: idl.json (CC BY 4.0).