The hidden=until-found attribute in HTML enables any hidden content within an element to be searchable using in-page search. This feature implicitly sets content-visibility: hidden on the targeted element. When a user activates in-page search and enters a query, any matching content becomes visible and highlighted. It serves practical applications such as faux-accordions in developer documentation. Additionally, while the <details> element may now offer similar semantic functionality, hidden=until-found acts as a useful enhancement within user agent styles for improved content discovery.
The hidden=until-found attribute allows hidden content within an HTML element to be searchable in a browser with in-page search, revealing content when matches occur.
This feature sets the content-visibility: hidden property on the element, enabling hidden content to remain accessible through search functionalities in browsers.
The primary use case highlighted is its implementation in faux-accordions within Chrome for Developers documentation, providing a modern approach to content disclosure.
The <details> element, though previously less supported, now provides a semantic alternative for displaying content through a more advanced user experience.
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