:matches() was renamed to :is()

[petamoriken]

The CSS Working Group just discussed Rename :matches() to :is(), and agreed to the following:

• RESOLVED: Rename :matches() to :is() and deprecate :matches() in Safari and anywhere else using it

w3c/csswg-drafts#3258 (comment)

[jonathantneal]

Excellent. The ID needs to be renamed to is-pseudo-class.

[petamoriken]

@jonathantneal Done 😄

[ExE-Boss]

When is this getting merged?

[jonathantneal]

This is further complicated now, but it’s not your fault. The caniuse data is going to be misleading because it refers to :matches and the PostCSS plugin needs to be pulled because it implements the wrong version of matches. See: postcss/postcss-selector-matches#16

[jonathantneal]

I’m going to change :matches to stage of -1, then add is separately. If you want to make the change, I’ll merge it from this PR. Otherwise, I’ll make a separate PR and close this.

[ExE-Boss]

LGTM, r+

[ExE-Boss]

review?(@jonathantneal): You might want to squash and merge this.

[ExE-Boss]

You might want to sort this alphabetically, so that is-pseudo-class is after in-out-of-range-pseudo-class, but before lab-function.