[accordion] Support "hidden=until-found" pattern

[oliviertassinari]

Summary

The hidden="until-found" attribute isn't widely available yet: https://caniuse.com/mdn-html_global_attributes_hidden_until-found_value but it would be great to plan its support. It's better UX. https://developer.chrome.com/docs/css-ui/hidden-until-found for more details

We also have something related to not mounting children to save performance https://mui.com/material-ui/react-accordion/#performance, and this would be another part of the tradeoff for developers when deciding which path they take.

Examples

• React Aria added support in Accordion adobe/react-spectrum#6931.

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[colmtuite]

@oliviertassinari It's already supported in our Accordion component.

[oliviertassinari]

@colmtuite I have linked this issue with its PR 4 minutes before you commented 👍.

I noticed this issue while I was browsing with Jose the tiptap pricing page and got frustrated I couldn't search in their FAQ accordion https://tiptap.dev/pricing.

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