title: Default HTML font size
body: <p>I wonder what the default html font-size is and I can't find the answer.</p>
  
  <p>What I mean is this :</p>
  
  <p>What is the font size in pixels corresponding to this :</p>
  
  <pre><code>html {
      font-size: 100%;
  }
  </code></pre>
  
  <p>It could be useful to know this if you need to calculate rem font sizes.</p>