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For the `useId` algorithm we used colon `:` before and after. https://github.com/facebook/react/pull/23360 This avoids collisions in general by using an unusual characters. It also avoids collisions when concatenated with some other ID. Unfortunately, `:` is not a valid character in `view-transition-name`. This PR swaps the format from: ``` :r123: ``` To the unicode: ``` «r123» ``` Which is valid CSS selectors. This also allows them being used for `querySelector()` which we didn't really find a legit use for but seems ok-ish. That way you can get a view-transition-name that you can manually reference. E.g. to generate styles: ```js const id = useId(); return <> <style>{` ::view-transition-group(${id}) { ... } ::view-transition-old(${id}) { ... } ::view-transition-new(${id}) { ... } `}</style> <ViewTransition name={id}>...</ViewTransition> </>; ```