CSSTransition

The CSSTransition interface of the Web Animations API represents an Animation object used for a CSS Transition.

Inherits methods from its ancestor Animation and adds transitionProperty.

CSSTransition.transitionPropertyRead only

Returns the transition CSS property name as a CSSOMString.

No specific event handlers; inherits methods from its ancestor Animation.

No specific methods; inherits methods from its ancestor Animation.

The transition in the following example changes the width of the box on hover. Calling Element.getAnimations() returns an array of all Animation objects. In our case this returns a CSSTransition object, representing the animation created.

.box {
  background-color: #165baa;
  color: #fff;
  width: 100px;
  height: 100px;
  transition: width 4s;
}

.box:hover {
  width: 200px;
}

const item = document.querySelector(".box");
item.addEventListener('transitionrun', () => {
  let animations = document.querySelector(".box").getAnimations();
  console.log(animations[0]);
});