title: best practice font size for mobile
body: <p>I have seen this question on SO:</p>
  
  <p><a href="https://stackoverflow.com/questions/6140430/what-are-the-most-common-font-sizes-for-h1-h6-tags">What are the most common font-sizes for H1-H6 tags</a>
  with this being the recommended font sizes fo H tags:</p>
  
  <pre><code>h1 { font-size: 2em; }
  h2 { font-size: 1.5em; }
  h3 { font-size: 1.17em; }
  h5 { font-size: .83em; }
  h6 { font-size: .75em; }
  </code></pre>
  
  <p>Is there a 'best practice' for these for mobile phones? -say iphone screen size?</p>