Definition
Web Animations Level 2 defines AnimationTriggerOptions
dictionary AnimationTriggerOptions {
AnimationTimeline? timeline;
AnimationTriggerType? type = "once";
(TimelineRangeOffset or CSSNumericValue or CSSKeywordValue or DOMString) rangeStart = "normal";
(TimelineRangeOffset or CSSNumericValue or CSSKeywordValue or DOMString) rangeEnd = "normal";
(TimelineRangeOffset or CSSNumericValue or CSSKeywordValue or DOMString) exitRangeStart = "auto";
(TimelineRangeOffset or CSSNumericValue or CSSKeywordValue or DOMString) exitRangeEnd = "auto";
};