[Nightly][WebAPI] [cssom-view] Extend checkVisibility to expose content-visibility: auto state

[Rumyra]

Acceptance Criteria

• The listed features are documented sufficiently on MDN
• BCD is updated
• Interactive example and data repos are updated if appropriate
• The content has been reviewed as needed

For folks helping with Firefox related documentation

• Set bugs to dev-doc-complete
• Add entry to Firefox release notes if feature is enabled in release
• Add entry to Firefox experimental features page if feature is not yet enabled in release

Related Gecko bugs

https://bugzilla.mozilla.org/show_bug.cgi?id=1859852

Other

• Check content open issues to see if any pertain to the subject matter. If there are any that can be closed because of the work, do so. If there are any that can be fixed relatively quickly because of the knowledge from completing this issue and you have time, feel free to go ahead and fix them.
• Check if glossary updates are required for the feature you're documenting - whether an existing term needs to be updated or a new term should be added.
• Check if BCD update means that content pages need to have experimental markup removed or deprecated markup added (front matter tags and macros).

[hamishwillee]

It is not clear if this is nightly or not. The feature this tests is only available in preview (or at least mostly). However the result of the actual check is always correct whether in preview or not ( Element.checkVisibility() returns false by default, and that is correct if not in preview for the particular option you can pass.

I waiting for confirmation from Engineers/BCD, but for now assuming that it is in preview only (so might need minor update).

Status

• BCD Ff122 Element.checkVisibily options browser-compat-data#21715
• Docs - Element.checkVisibility() - docs #31322
• Experimental features - FF122 ExprFeatre: Element.checkVisibility() supports options.contentVisibilityAuto #31215
• dev-docs-complete