Some helpful advice from the @hearsparkbox crew on getting the results you want from the transitionEnd event: seesparkbox.com/foundry/css_…
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interesting. The spec doesn’t mention that shorthand -> longhands behavior and probably should (cc @davidbaron)
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The model in drafts.csswg.org/css-transit… is that transitions only run on longhands, which carries over to rules for events.
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I think it deserves a Note to help authors tho
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Replying to @smfr @vlh
It's already reasonably clear in drafts.csswg.org/css-transit… too? Does it need a separate note in section on events?

Mar 8, 2017 · 4:39 PM UTC

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Replying to @davidbaron
I think it does, to reduce author surprise that event.propertyName doesn’t always match with specified transition-property,
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OK, note added in hg.csswg.org/drafts/rev/b8bb… which shows up at drafts.csswg.org/css-transit…
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Replying to @davidbaron
because of both shorthand expansion, and registering on longhand firing on a shorthand transition
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