HTML defines that the <dialog> element has an "is modal" flag, and uses that as a styling hook. We just discussed adding some more properties to modal dialogs in the UA stylesheet, which would need to do the same.
This should just be handled as a real pseudo-class, rather than an abstract "pretend these styles were applied as if from the UA stylesheet".
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4