This is an experimental technologyCheck the Browser compatibility table carefully before using this in production. Summary The AnimationEvent.pseudoElement read-only property is a DOMString, 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: ''. Syntax name = AnimationEvent.pseudoElement Specifications Specification Status Comment CSS AnimationsThe definition of 'AnimationEvent.pseudoElement' in that specification. Working Draft Initial definition. Browser compatibility Desktop Mobile Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari Basic support No support 23.0 (23.0) No support No support No support Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Basic support No support 23.0 (23.0) No support No support No support See also Chromium Issue 437132 Using CSS animations Animation-related CSS properties and at-rules: animation, animation-delay, animation-direction, animation-duration, animation-fill-mode, animation-iteration-count, animation-name, animation-play-state, animation-timing-function, @keyframes. The AnimationEvent interface it belongs to.