Function resolveDurationForElement

packages/core/src/runtime/init.ts:483–495

(
    element: Element,
    opts?: { includeAuthoredTimingAttrs?: boolean },
  )

  };

  const resolveDurationForElement = (
    element: Element,
    opts?: { includeAuthoredTimingAttrs?: boolean },
  ): number | null => {
    const resolver = createRuntimeStartTimeResolver({
      timelineRegistry: (window.__timelines ?? {}) as Record<
        string,
        RuntimeTimelineLike | undefined
      >,
      includeAuthoredTimingAttrs: opts?.includeAuthoredTimingAttrs ?? true,
    });
    return resolver.resolveDurationForElement(element);
  };

  const resolveMediaStartSeconds = (element: Element, fallback = 0): number => {
    if (!element.hasAttribute("data-hf-auto-start") && element.hasAttribute("data-start")) {