[csswg-drafts] Pull Request: [selectors4] :is() has specificity

ewilligers has just labeled a pull request from ewilligers for https://github.com/w3c/csswg-drafts as "selectors-4":

== [selectors4] :is() has specificity ==
The functional pseudo-class like :where() but with specificity
is named :is() instead of :matches().
https://github.com/w3c/csswg-drafts/issues/3258#issuecomment-438742190

resolves #3258

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Copy the above line into the Title and replace with the relevant details. Fill in any additional details here. See https://github.com/w3c/csswg-drafts/blob/master/CONTRIBUTING.md for more info.


See https://github.com/w3c/csswg-drafts/pull/3317