title: Is there a de-facto relation between the font size ranges {1, 2, 3, 4, 5, 6, 7} and {xx-small, x-small, small, medium, large, x-large, xx-large}?
body: <p>In HTML/CSS font size can be specified in the following fashion (deprecated but all browsers support it):</p>
  
  <pre><code>&lt;font size="n"&gt;text&lt;/font&gt;
  </code></pre>
  
  <p>with <code>n</code> an element of <code>{1, 2, 3, 4, 5, 6, 7}</code>.</p>
  
  <p>Another possibility is the following:</p>
  
  <pre><code>&lt;span style="font-size: s;"&gt;text&lt;/span&gt;
  </code></pre>
  
  <p>with <code>s</code> an element of <code>{xx-small, x-small, small, medium, large, x-large, xx-large}</code>.</p>
  
  <p>Is there any de-facto relation between the two ranges? I figured they refer to the same sizes, as they have both seven elements, but that turns out not to be the case.</p>