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Custom elements in React
It took a while, but it's happening!
React 19 […] will have direct support for custom elements. Developers can expect that all tests on custom-elements-everywhere.com will pass by default going forward, like they currently do in the experimental channels. Release date, as well as docs for what's supported, still to be announced.
(From: RFC: Plan for custom element attributes/properties in React 19 · Issue #11347 · facebook/react)