resolveLabel function ✓ 100.0%

function resolveLabel(el: Element): string | undefined {
  if (
    el instanceof HTMLInputElement ||
    el instanceof HTMLSelectElement ||
    el instanceof HTMLTextAreaElement
  ) {
    const id = el.id;
    if (id) {
      const labelEl = document.querySelector(`label[for="${CSS.escape(id)}"]`);
      if (labelEl?.textContent?.trim()) return labelEl.textContent.trim();
    }
  }

  // Try closest label ancestor
  const parentLabel = el.closest("label");
  if (parentLabel?.textContent?.trim()) return parentLabel.textContent.trim();

  // aria-label
  const ariaLabel = el.getAttribute("aria-label");
  if (ariaLabel) return ariaLabel;

  // placeholder
  if (el instanceof HTMLInputElement || el instanceof HTMLTextAreaElement) {
    if (el.placeholder) return el.placeholder;
  }

  return undefined;
}