5.Table - Search Engine

function solve() {
   document.querySelector('#searchBtn').addEventListener('click', onClick);

   function onClick() {
      //   TODO:
  const listTr= document.querySelectorAll('table.container tbody tr');
  const searchfield= document.querySelector('#searchField');

  for (const trel of listTr) {

   const listv=trel.querySelectorAll('td');
   let issearched= false;

   trel.className='';
   for (const el of listv) {

     if(el.textContent.toLowerCase().includes(searchfield.value) ){
      issearched= true;
      break;
     }
   }
   if(issearched ==true){
      trel.className='select';
   }
  }
   }
}