interface dom.OptionalEffectTimingimport { type dom } from "https://deno.land/x/evt@v2.5.2/mod.ts"; const { OptionalEffectTiming } = dom; Propertiesoptionaldelay: numberoptionaldirection: PlaybackDirectionoptionalduration: number | stringoptionaleasing: stringoptionalendDelay: numberoptionalfill: FillModeoptionaliterationStart: numberoptionaliterations: number