title: HTML character code to underline next character
body: <p>Like:</p>
  
  <pre><code>abcdef 
   _
  </code></pre>
  
  <p>What HTML character code I need to insert before <code>b</code> to make b underlined?</p>
  
  <p>I need this inside a html attribute (value of a input field), so html tags like <code>&lt;u&gt;</code> are not acceptable</p>
  
  <hr>
  
  <p>example:</p>
  
  <p><code>&lt;input type="submit" value="UnderlineMeifUknowHow" accesskey="n" /&gt;</code></p>
  
  <p>I want the first "n" from UnderlineMeifUknowHow to be underlined</p>