title: how to select a child of an element with a certain property
body: <p>Does anybody know how I can select all children of an element which have display == block?
  I found the jquery children() function which does allow filters, but I haven't figures out yet how to filter for style.display == block?</p>
  
  <pre><code>$('#div_id').children('div.style.display == block')
  </code></pre>