How do you detect when CSS animations start and end with JavaScript?

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Bind the appropriate events to the element, e.g.

el.addEventListener("animationstart", function() {}, false);
el.addEventListener("animationend", function() {}, false);
el.addEventListener("animationiteration", function() {}, false);

https://developer.mozilla.org/en-US/docs/CSS/Tutorials/Using_CSS_animations#Using_animation_events

Note: You may need to add the appropriate prefixed-events as well, e.g. webkitAnimationEnd

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