Re: [csswg-drafts] [selectors-4] :defined

`:defined` matches all elements that had no problem during construction, roughly. It's useful since you can now implement your own element class and sometimes you want to match elements for which the constructor has not yet run (or vice versa).

As for headings, that sounds reasonable, though we'll run into the data model issue again (though arguably we do already for other things, so it doesn't necessarily add to the problem).

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Received on Saturday, 3 February 2018 07:37:53 UTC