The AnimationEvent.pseudoElement read-only property is a string, starting with '::', containing the name of the pseudo-element the animation runs on. If the animation doesn't run on a pseudo-element but on the element, an empty string: ''.
A string, starting with '::', containing the name of the pseudo-element the animation runs on.
animation, animation-delay, animation-direction, animation-duration, animation-fill-mode, animation-iteration-count, animation-name, animation-play-state, animation-timing-function, @keyframes.AnimationEvent interface it belongs to.