Interface KeyframeEffectOptions

interface KeyframeEffectOptions {
    composite?: CompositeOperation;
    delay?: number;
    direction?: PlaybackDirection;
    duration?: string | number | CSSNumericValue;
    easing?: string;
    endDelay?: number;
    fill?: FillMode;
    iterationComposite?: IterationCompositeOperation;
    iterations?: number;
    iterationStart?: number;
    playbackRate?: number;
    pseudoElement?: null | string;
}