code: function tableDoesNotHaveHeaderRow(rows) {
          var headerRow = rows[0];
  
          var headerCells = headerRow.children;
  
          for (var i = 0; i < headerCells.length; i++) {
              if (headerCells[i].tagName != 'TH') {
                  return true;
              }
          }
          return false;
      }
docs: Checks for a header row in a table.
  
  @param {NodeList} rows tr elements
  @returns {boolean} Table does not have a complete header row