until-found should be listed as a separate row in the BCD table

[connorshea]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/hidden

What specific section or headline is this issue about?

Browser compatibility

What information was incorrect, unhelpful, or incomplete?

hidden="until-found" wasn't added to browsers until recently, e.g. Safari 26.2. But the page doesn't communicate this to the reader.

What did you expect to see?

Some sort of note and/or row in the table to communicate that the until-found value was introduced later, a while after hidden itself.

It looks like BCD tracks this separately already, so the MDN page just needs to be updated to list the relevant data in a separate row, I assume?

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

No response

MDN metadata

Page report details

• Folder: en-us/web/api/htmlelement/hidden
• MDN URL: https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/hidden
• GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/web/api/htmlelement/hidden/index.md
• Last commit: mdn/content@6ef7bc0
• Document last modified: 2025-11-09T02:29:26.000Z

[Josh-Cena]

This page is for the IDL binding, where the subfeature doesn't exist. The subfeature does exist for HTML. So this should still be fixed in BCD instead.