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Normally we allow any attribute/property on custom elements. However it's a shared namespace. The `aria-` namespace applies to all generic elements which are shared with custom elements. So arguably adding custom extensions there is a really bad idea since it can conflict with future additions. It's possible there is a new standard one that's polyfilled by a custom element but the same issue applies to React in general that we might warn for very new additions so we just have to be quick on that. cc @josepharhar DiffTrain build for commit https://github.com/facebook/react/commit/1a1d61fed98a02c9b1bac029d0bc11c3e4db896d.