Custom element has added the `is` attribute, currently there is no specific syntax for `is` like `.class` or `#id`. If no other background, I worry about that devs could be confused what `a:is(b)` mean (select `<a is=b>`?) -- GitHub Notification of comment by hax Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3258#issuecomment-439006553 using your GitHub accountReceived on Thursday, 15 November 2018 11:18:48 UTC
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