https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/130
The name attribute of the <details> element now allows the grouping of <details> elements, where only one element within a group can be open at a time. This allows you to create an exclusive accordion without using JavaScript
(Safari 17.2 and Chrome 120 supported it already so Firefox was the straggler here)
i saw the css crimes before the announcement. this makes so much sense now