title: Not able to click on span using selenium webdriver
body: <p>I have following code in which I want to click on span,</p>
  
  <pre><code>&lt;div class = "class1"&gt;
      &lt;button class="class2 class3 class4 class5" role="button" type="Button"&gt;
          &lt;span class="class6"&gt;Add&lt;/span&gt;
      &lt;/button&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>What should be the correct code to click on Add button?</p>
  
  <p>I am using Firefox driver.</p>
  
  <p>Thanks in advance.</p>