[CSS] :user-valid and :user-invalid pseudo-classes

[chrisdavidmills]

Acceptance criteria

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

Features to document

1. :user-valid
2. :user-invalid

Related Gecko bugs

1. • Implement the user-valid and user-invalid pseudo-classes. We have a :user-invalid page, but not a :user-valid one. So bit of page creation, BCD updates, and interactive example creation? Quite an involved one, this, but should be fun.

For folks helping with Firefox-related documentation features — make sure above AC have been done, but also:

• 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

[rachelandrew]

@chrisdavidmills we do have https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-ui-valid (which is the one flagged for removal but I think is the pair to https://developer.mozilla.org/en-US/docs/Web/CSS/:user-invalid which also mentions the -moz property).

I'm thinking to rename this page.

[chrisdavidmills]

@chrisdavidmills we do have https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-ui-valid (which is the one flagged for removal but I think is the pair to https://developer.mozilla.org/en-US/docs/Web/CSS/:user-invalid which also mentions the -moz property).

I'm thinking to rename this page.

Ah, good call — yup, makes sense!

[rachelandrew]

@chrisdavidmills I still can't move things #2852 (comment)

Can I just do these by hand? I was doing before and nothing terrible happened. It's a bit of a blocker otherwise.

[chrisdavidmills]

@chrisdavidmills I still can't move things #2852 (comment)

Can I just do these by hand? I was doing before and nothing terrible happened. It's a bit of a blocker otherwise.

For now, just go for it, until this gets fixed.

[rachelandrew]

The linked PRs I think sort this one. I've also updated the release notes and the Bugzilla bug.

[chrisdavidmills]

Closing this one; only a few merge conflicts to fix up.