To be clear, under my current proposal, your example would be: `<day part="day" part-class="weekday Saturday week-1 us-holiday">`, a 'class' attribute would not be exposed on the part but could be used within the custom element normally. And it would be selected as: `::--day.us-holiday`, the pseudo-class notation would be used to select custom state of the part, e.g. `::--day.us-holiday:--checked`. I believe this satisfies all the use cases, brings shadow part selector syntax into alignment with custom pseudo-classes, and allows the extension I mentioned above of allowing custom elements to potentially create built-in pseudo elements as well. And, like custom state is now really 'custom pseudo-classes', it turns shadow parts into 'custom pseudo-elements'. -- GitHub Notification of comment by plinss Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/4900#issuecomment-625970489 using your GitHub accountReceived on Friday, 8 May 2020 19:07:14 UTC
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