NewShazzer now has an MCP server. Let Claude search, create and fuzz your vectors from Claude Desktop or Claude Code.Get an API keyWhat's new
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. Shipping in Firefox 159 (released 2026-10-27). Probes CustomElementRegistry.CustomElementRegistry. More: developer.mozilla.org/docs/Web/API/CustomElementRe… html.spec.whatwg.org/multipage/custom-elements.htm… web-platform-dx.github.io/web-features-explorer/fe…
(function(){try{new CustomElementRegistry();return true}catch(e){return false}})()No feature results yet. Run the test, or wait for the fuzzing network to run it across browsers.