title: Is there a way to add/remove several classes in one single instruction with classList?
body: <p>So far I have to do this:</p>
  
  <pre><code>elem.classList.add("first");
  elem.classList.add("second");
  elem.classList.add("third");
  </code></pre>
  
  <p>While this is doable in jQuery, like this</p>
  
  <pre><code>$(elem).addClass("first second third");
  </code></pre>
  
  <p>I'd like to know if there's any native way to add or remove.</p>