I've tested on an ePub2 (ADE 2.0.1) renderer and it does what it should do with unknown elements and disregards them. Now if Adobe had extended that to errors in the stylesheet.
The few clips I currently use for epub:type, role, aria-labelledby mostly do blocks of related elements. Much like your example in message #12 but with the types filled in.
Last edited by DNSB; 06-09-2025 at 01:46 PM.
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