title: Get only first class of an HTML element
body: <p>I'm using the</p>
  <pre><code>event.target.className
  </code></pre>
  <p>to get the <code>ClassName</code>, but sometimes an element has multiple class names, how can I make it,
  so it <strong>only</strong> gives the <strong>first class</strong> name as outcome?</p>
  <p>Oh, and please without jQuery.</p>