code: function tableDoesNotHaveGridLayout(rows) {
          var headerCells = rows[0].children;
  
          for (var i = 1; i < headerCells.length; i++) {
              if (headerCells[i].tagName != 'TH') {
                  return true;
              }
          }
  
          for (var i = 1; i < rows.length; i++) {
              if (rows[i].children[0].tagName != 'TH') {
                  return true;
              }
          }
          return false;
      }
docs: Checks whether a table has grid layout with both row and column headers.
  
  @param {NodeList} rows tr elements
  @returns {boolean} Table does not have a complete grid layout