The getAnimations() method of the ShadowRoot interface returns an array of all Animation objects currently in effect whose target elements are descendants of the shadow tree. This array includes CSS Animations, CSS Transitions, and Web Animations.

None.

An Array of Animation objects, each representing one animation currently associated with elements which are descendants of the ShadowRoot on which it's called.

The following code snippet will slow down all animations in a shadow tree by halving their Animation.playbackRate.

let customElem = document.querySelector("my-shadow-dom-element");
let shadow = customElem.shadowRoot;
shadow.getAnimations().forEach((animation) => {
  animation.playbackRate *= 0.5;
});

• Web Animations API
• CSS Animations
• CSS Transitions
• Element.getAnimations() - Fetch only the animations on a single Element and its descendants.
• Animation