For example if I implement a custom checkbox check animation, I’d like to know when it ended. Currently I’m using a timeout with the same duration, but it is not very accurate - it looks like sometimes I get the timeout (with normal priority) significantly later than expected. And it is kind of ugly code wise 
In other words I’m looking for gtk’s “animationend” equivalent.
No, there isn’t. CSS animations are not available to the widget, because unlike the web platform, there’s no CSS object model.
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