title: How do I make a button that make size bigger in Javascript?
body: <p>I want to make a button that increases the font size by a specific number of pixels or any other unit. 
  I tried this:<br> <code>---.style.fontSize += "5px"</code> <br> but it didnt work. What is the correct way? </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;html id="html"&gt;
  &lt;h1&gt;Lorem ispum&lt;/h1&gt;
  &lt;p&gt;Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.&lt;/p&gt;
  
  &lt;p&gt;Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a&lt;/p&gt;
  &lt;button onclick="document.getElementById('html').style.fontSize += '5px'"&gt;Bigger Size&lt;/button&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Please no Jquery. Thanks</p>