Some helpful advice from the @hearsparkbox crew on getting the results you want from the transitionEnd event: seesparkbox.com/foundry/css_…

interesting. The spec doesn’t mention that shorthand -> longhands behavior and probably should (cc @davidbaron)

The model in drafts.csswg.org/css-transit… is that transitions only run on longhands, which carries over to rules for events.

I think it deserves a Note to help authors tho

It's already reasonably clear in drafts.csswg.org/css-transit… too? Does it need a separate note in section on events?

I think it does, to reduce author surprise that event.propertyName doesn’t always match with specified transition-property,