title: Should I use ² or <sup>2</sup>
body: <p>In consideration of machine based readability (but not exclusively, please advice where relevant), is it better to use</p>
  
  <pre class="lang-html prettyprint-override"><code>square²
  </code></pre>
  
  <p>or</p>
  
  <pre class="lang-html prettyprint-override"><code>square&lt;sup&gt;2&lt;/sup&gt;
  </code></pre>
  
  <p>in my HTML file (using utf-8 encoding)?</p>