Open Bug 1484145 Opened Last year
Should we fire transition events for disowned elements / elements in display:none subtrees?
See bug 1467344 comment 28. If we re-start a transition in an element that is display:none we don't fire a 'transitionrun' event. Honestly, I'm not sure we should dispatch events in this state where we don't have an owning element although I note that Chrome does fire 'transitionend' events in this state.  https://drafts.csswg.org/css-transitions-2/#owning-element
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