let hdr=null;
for (const el of document.querySelectorAll('div,table')) {
  const x=(el.innerText||'');
  if (/序号/.test(x) && /错误对象/.test(x) && x.length<200) { hdr=el; break; }
}
if(!hdr) return {err:'no header'};
const info=[];
let box=hdr;
for (let i=0;i<6&&box.parentElement;i++) {
  box=box.parentElement;
  info.push({i, tag:box.tagName, cls:String(box.className).slice(0,60), len:(box.innerText||'').length,
             txt:(box.innerText||'').replace(/\s+/g,' ').slice(0,200)});
}
return {info};