function getSelector(el: HTMLElement) {
  if (el.id) return `#${el.id}`;
  const p = el.parentNode;
  if (!p || !(p as HTMLElement).tagName) return el.tagName.toLowerCase();
  const n = [].indexOf.call(p.children, el) + 1;
  return `${getSelector(
    p as HTMLElement
  )} > ${el.tagName.toLowerCase()}:nth-child(${n})`;
}

function triggerFullscreen() {
  if (!document.fullscreenElement) {
    document.body.requestFullscreen();
  } else {
    document.exitFullscreen();
  }
}