Re: [csswg-drafts] [css-transitions-1] Define before/after-change style in terms of base (#6688)

> @birtles In light of this, do you think we should do the following?
> 
> > We could explicitly specify in https://drafts.csswg.org/css-transitions-1/#starting that a transition should not start if there's currently an animation on the same property. I don't think that behavior must arise from the current definition of before/after-change style?

I think so. Transition events are quite important to a lot of apps -- often various state changes are keyed off getting a `transitionend` event. I think any change to the circumstances under which transition events are dispatched is risky and we should try to match the current (interoperable) behavior there.

(Anecdotally, many many years ago when working on Firefox OS, a recurring cause for apps breaking was that they didn't receive expected `transitionend` events which is what motivated specifying the `transitioncancel` event.)

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Received on Friday, 18 February 2022 01:52:02 UTC