The Animation.finished read-only property of the Web Animations API returns a Promise which resolves once the animation has finished playing.

A Promise object which will resolve once the animation has finished running.

The following code waits until all animations running on the element elem have finished, then deletes the element from the DOM tree:

Promise.all(elem.getAnimations().map((animation) => animation.finished)).then(
  () => elem.remove(),
);

• KeyframeEffect
• Web Animations API
• Animation