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 * in the documentation and/or other materials provided with the
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// https://drafts.csswg.org/web-animations/#the-keyframeeffect-interface

enum CompositeOperation { "replace", "add", "accumulate" };

[
    Exposed=Window
] interface KeyframeEffect : AnimationEffect {
  [CallWith=ScriptState, RaisesException, Measure] constructor(Element? target, object? keyframes, optional (unrestricted double or KeyframeEffectOptions) options);
  [CallWith=ScriptState, RaisesException, Measure] constructor(KeyframeEffect source);
  attribute Element? target;
  [RuntimeEnabled=WebAnimationsAPI, RaisesException=Setter] attribute CSSOMString? pseudoElement;
  [RuntimeEnabled=WebAnimationsAPI] attribute CompositeOperation composite;
  [CallWith=ScriptState, RuntimeEnabled=WebAnimationsAPI] sequence<object> getKeyframes();
  [CallWith=ScriptState, RaisesException, RuntimeEnabled=WebAnimationsAPI] void setKeyframes(object? keyframes);
};