title: Buttons to play Audio in Mechanical Turk
body: <p>We would like to integrate audio in an Amazon Mechanical Turk HIT, with buttons to play and increase or decrease volume.</p>
  
  <pre><code>&lt;audio id="player" src="test.mp3"&gt;&lt;/audio&gt; 
  &lt;button onclick="document.getElementById('player').play()"&gt;Play&lt;/button&gt; 
  &lt;button onclick="document.getElementById('player').volume += 0.1"&gt;Vol+ &lt;/button&gt;  
  &lt;button onclick="document.getElementById('player').volume -= 0.1"&gt;Vol- &lt;/button&gt;
  </code></pre>
  
  <p>The problem is that any button press is also interpreted as a Submit and the HIT is submitted. How can that be avoided?</p>