Function resolveDuration

packages/core/src/runtime/clipTree.ts:79–92

(
  el: Element,
  timelineRegistry: Record<string, RuntimeTimelineLike | undefined>,
  rootDuration: number,
  absoluteStart: number,
)

// Used only to filter out zero-duration (decorative) elements at build time.
function resolveDuration(
  el: Element,
  timelineRegistry: Record<string, RuntimeTimelineLike | undefined>,
  rootDuration: number,
  absoluteStart: number,
): number {
  const attr = parseNum(el.getAttribute("data-duration"));
  if (attr != null && attr > 0) return attr;
  return (
    durationFromTimeline(el, timelineRegistry) ??
    durationFromMedia(el) ??
    Math.max(0, rootDuration - absoluteStart)
  );
}

function linkParentChild(elementToNode: Map<Element, MutableClipNode>): void {
  for (const [el, node] of elementToNode) {