[extra88]

Yes, Google started revealing the contents of <details> a few years ago, long after the element was supported in all browsers. Firefox added support earlier this year and Safari just added it.

Supporting the behavior was related to changing the user agent CSS when they're closed and the other browsers implemented it and hidden=until-found at the same time.

https://caniuse.com/mdn-html_elements_details_search_match_o...