dom-builder.js

/*
  <table>
    <tr>
      <td class='data'><span>foo</span></td>
      <td class='data'><span>bar</span></td>
    </tr>
  </table>
*/

var table = $el('table', 
  $el('tr', [
    $el('td', {className : 'data'}, 
      $el('span', 'foo')),
    $el('td', {className : 'data'}, 
      $el('span', 'bar'))
  ])
);