const sleep=ms=>new Promise(r=>setTimeout(r,ms));
let leaf=null;
for (const el of document.querySelectorAll('*'))
  if (el.children.length===0 && (el.textContent||'').trim()==='导线 到 过孔 (2)') { leaf=el; break; }
if(!leaf) return {err:'no leaf'};
const chain=[];
let t=leaf;
for (let i=0;i<6&&t;i++){
  const props = (()=>{ for (const k of Object.keys(t)) if (k.startsWith('__reactProps$')) return t[k]; return null; })();
  chain.push({i, tag:t.tagName, cls:String(t.className).slice(0,60),
              props: props? Object.keys(props): null});
  t=t.parentElement;
}
return {chain};