What type of issue is this?

Incorrect support data (ex. Chrome says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

Page claims full support for display-mode media query in Safari but Safari does not support display-mode: fullscreen.

Discussed on this StackOverflow post: https://stackoverflow.com/questions/71691474/css-media-query-display-mode-fullscreen-does-not-work-on-safari and can be reproduced in browser on Safari 16.3 on macOS Ventura.

What browsers does this problem apply to, if applicable?

Safari

What did you expect to see?

Indication of incomplete Safari support

Did you test this? If so, how?

Yes. Open latest Safari on latest macOS. Force the page into fullscreen by calling document.documentElement.webkitRequestFullscreen() after a page interaction (easiest way is to attach it to an event listener like click, but you could also mockup a button to do it). Then check the media query display-mode:fullscreen and note that it incorrectly returns false.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://stackoverflow.com/questions/71691474/css-media-query-display-mode-fullscreen-does-not-work-on-safari

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/CSS/@media/display-mode

MDN metadata