title: IE: Object doesn't support property or method 'closest'
body: <p>I am getting "Object doesn't support property or method 'closest'" error in IE. I am using MooTools. Can anyone help me..</p>
  
  <pre><code>var li = $$('.list')[0].clone(true, true);
  
  var NewContainer = li.getElement('div.tile');
  
  NewContainer.removeProperty('style');
  
  NewContainer.set('id', 'container_'+catId);
  
  NewContainer.closest('li').set('id', 'list_'+countID);
  </code></pre>