Scoped custom element registries
The CustomElementRegistry() constructor creates a new custom element registry that's separate from the global window.customElements registry. Creating more than one registry is useful for multiple custom elements that have the same tag name to coexist.
Status
Limited availability
MDN documentation
Specifications
- HTML (#custom-elements-api), from HTML Workstream (WHATWG).
- DOM (#element-custom-element-registry), from DOM Workstream (WHATWG).
Browser support
- Chrome 146 Released on 2026-03-10
- Chrome Android 146 Released on 2026-03-10
- Edge 146 Released on 2026-03-13
- Firefox ❌ See bugzil.la/1874414 bugzil.la/2018900
- Firefox for Android ❌
- Safari 26 Released on 2025-09-15
- Safari on iOS 26 Released on 2025-09-15
Baseline availability blocked since March 2026 by Firefox (1 months)
Interop
- Included in Interop 2026
Web Platform Tests (WPT)
View the latest WPT test results for this featureDeveloper votes
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