TabAtkins: About https://wpt.fyi/results/css/css-animations/animation-canceled-by-parent-details-element-being-closed.html, I’m trying to figure out what that test should rightly be checking — rather than checking for a cancel event to fire.

Looking at https://drafts.csswg.org/css-animations/ and at https://drafts.csswg.org/css-contain-2/#:~:text=While%20an%20element%20is%20skipped%2C%20CSS%20transitions%20and%20animations%20on%20the%20element%20do%20not%20update, I can find neither any spec support for firing a cancel event for that case, nor can I figure out what other event might supposed to be fired instead.

I’d like to fix the test, but at this point, I have no idea what to make it check for.