FF122 ExprFeatre: Element.checkVisibility() supports options.contentVisibilityAuto

[hamishwillee]

FF122 adds support to get whether an element's rendering is been skipped due to content-visibility:auto being set. The support is a new property of the Element.checkVisibility() options parameter object named contentVisibilityAuto. There are also two other options opacityProperty and visibilityProperty created as aliases of other existing options in the same bugzilla https://bugzilla.mozilla.org/show_bug.cgi?id=1859852

There are two complications:

• The CSS that allows content to be skipped is in preview. That means that checkVisibility() will always return the correct value even now (because it will be false if not in preview).
• The other two properties are not related to the content-visibility features.

So I think these new options are effectively released, but I'm not sure, and I'm in discussion with BCD/engineering.

For now I have put all these options in experimental features associated with the content-visibility:auto information. I would have some of this information here in any case. But I may need to move some of it to release notes depending on how the discussion falls out with BCD team.

Other docs work for this can be tracked in #31107

[github-actions]

Preview URLs

• /en-US/docs/Mozilla/Firefox/Experimental_features

Flaws (1)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox
Flaw count: 1

• macros:
  • /en-US/docs/Web/API/Element/checkVisibility does not exist

External URLs (2)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox

• https://bugzil.la/1791759 (1 time) (Note! This may be a new URL 👀)
• https://bugzil.la/1859852 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2024-01-08 00:01:42)

[hamishwillee]

@pepelsbey I'm away for a couple of weeks from tomorrow so if you can't look at this today I won't be here to respond to any review comments. If the comments are just editorial, please integrate and self-merge. I will also try find someone else to look at this today in case you are away still.

[teoli2003]

👍