Re: [csswg-drafts] [selectors4] Name the “functional pseudo-class like :matches() with 0 specificity”

I would vote for `:is()`. It's short, and it explains what it does. IIRC most people were in favor of `:is()` both in the thread and at the F2F. If you want an explicit resolution, we could add it to the agenda.

This is the twitter thread where I asked authors for ideas: https://twitter.com/LeaVerou/status/928426600558862337
As you will see, the results are not very useful.

Regarding the other names:
- `:when` sounds time-related
- `:nospecificity` is ridiculously long and prevents any possibility of expansion in the future to allow setting specificity, as @tabatkins suggested.
- `:filter` is confusing because it sounds related to the `filter` property and the `filter()` function.

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