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This is false, recently the details element has gotten support for grouping them: the [name] attribute. This effectively enforces tab-like semantics where only one of the grouped details elements can be open at a time.

This is a quite recent addition and the modern web is evolving too fast so I wouldn't put it past myself for missing this :)

Yay for progress and for JavaScript free solutions!

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No, it's still true. I'm aware of that hack, but unfortunately it doesn't solve the problems with pure HTML and CSS tabs.

Crucially, the `name` attribute does not semantically turn a group of <details> elements into a set of tabs. All it does is introduce the (visual) behavior where opening one <details> element closes the others.

I posted a list of accessibility issues with the <details> hack in another comment: https://news.ycombinator.com/item?id=46415271

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