Coverage / css-transitions

CSS Transitions Module Level 1

Specification: drafts.csswg.org/css-transitions-1/. 1 interface defined here, 23 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.

Share present per engine
Engine	Members present	Interfaces present
warpdom0.1.6maintainer's engine	13% (3 of 23)	1 of 1
happy-dom21.0.3	70% (16 of 23)	1 of 1
jsdom30.1.3	13% (3 of 23)	1 of 1
linkedom0.18.13	0% (0 of 23)	0 of 1

Document4 members added to Document (defined in DOM)0/44/40/40/4

HTMLElement4 members added to HTMLElement (defined in HTML)0/44/40/40/4

MathMLElement4 members added to MathMLElement (defined in MathML Core)0/40/40/40/4

SVGElement4 members added to SVGElement (defined in Scalable Vector Graphics (SVG) 1.1 (Second Edition))0/44/40/40/4

TransitionEvent3 membersPresentPresentPresentMissing

Window4 members added to Window (defined in HTML)0/44/40/40/4

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