WPT details: https://wpt.fyi/results/web-animations/interfaces/KeyframeEffect?label=master&product=chrome%5Bexperimental%5D&product=edge&product=firefox%5Bstable%5D&product=safari%5Bexperimental%5D&aligned (Compares Chrome experimental to Firefox stable + Safari experimental)
AnimationEffect and KeyframeEffect are part of the Web Animations API. They allow a developer interactive control over the following parts of their Animation: * the Animation target (i.e. what element is being animated) * the Animation timing properties (duration, delay, etc) We do not intend to ship the composite and iterationComposite members or the getKeyframes/setKeyframes methods at this time.
Explainers: https://www.w3.org/TR/web-animations-1/#the-animationeffect-interface https://www.w3.org/TR/web-animations-1/#the-keyframeeffect-interface