Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<ul>
  <li>
    <div class="thumb">
      <img src="image-1.jpg">
    </div>
  </li>
  <li>
    <div class="thumb">
      <img src="image-2.jpg">
    </div>
  </li>
  <li>
    <div class="thumb selected">
      <img src="image-3.jpg">
    </div>
  </li>
</ul>

Preparation code output

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$("div.selected img").attr("src")

$('img').filter(function() {
  return $(this).closest('div.selected').length;
}).attr('src');

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