css.properties.backdrop-filter - Support differs in FF v other browsers

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?

Chrome/Edge/Safari ignore nested backdrop-filter values AND ignore backdrop filter on inline elements. Even when prefixed.

Firefox applies backdrop-filters to nested elements and to inline elements.

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

I expected to see the FF behavior in terms of nested values, but am not sure if that implementation is correct. It seems to be:

See https://github.com/w3c/fxtf-drafts/issues/500.

I did not expect to see inline elements ignoring the values. I do not see in the spec that this should not apply to inline elements.

Did you test this? If so, how?

https://codepen.io/estelle/pen/LYJWOrW and https://codepen.io/estelle/pen/XWPRXWd

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

https://bugs.chromium.org/p/chromium/issues/list?q=backdrop-filter&can=2

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter

MDN metadata

Start by locating the css.properties.backdrop-filter compatibility entry and reproduce the linked CodePen cases for nested and inline elements. Review the linked FXTF discussion and browser evidence to determine the expected behavior, then update the support data only once the specification and implementation differences are resolved.