title: How to add triangle to input[type='text']
body: <p>I want to add a small triangle to the upper-right corner of an <code>input type='text'</code> HTML element, like Excel uses to indicate a comment.</p>
  
  <p>The accepted answer to this question:</p>
  
  <p><a href="https://stackoverflow.com/questions/14499048/how-to-add-triangle-in-table-cell">How to add triangle in table cell</a></p>
  
  <p>shows how to do it for a table cell.  I naively applied the "note" css class to my input element but it didn't work.  Any suggestions for how to achieve this?</p>