title: If span class contains certain text
body: <p>I have this html here</p>
  
  <pre><code>&lt;span id="js_11" class="timestampContent"&gt;December 16, 2013&lt;/span&gt;
  </code></pre>
  
  <p>I want to check if the span class contains the value 2013. How should i write the xpath?</p>
  
  <p>These are what i have tried so far and they are either invalid or has no matching nodes according to Firepath.</p>
  
  <pre><code>//span[@class='timestampContent']//span[contains(text(), '2013')]
  //class[contains(text(), '2013')]
  //@class="timestampContent" //span[contains(text(), '2013')]
  </code></pre>