help.html

<div id="overlay" style="display: none;">
  <center>
<div id="dialog">
  <h3 id="dialog-title">Keyboard shortcuts</h3>
<div id="close-link">
  <a id="close-button" href="#">Close</a>
</div>
<div id="links-table">
  <h3>On links page<h3>
  <table>
    <tr>
      <td class="comment"><span>Down</span></td>
      <td class="comment">Next link</td>
    </tr>
    <tr>
      <td class="comment"><span>Up</span></td>
      <td class="comment">Previous link</td>
    </tr>
    <tr>
      <td class="comment"><span>Right</span> or <span>Enter</span></td>
      <td class="comment">Open link in new tab (Hold Shift to open tab in background)</td>
    </tr>
    <tr>
      <td class="comment"><span>Left</span></td>
      <td class="comment">Open comments in new tab</td>
    </tr>
    <tr>
      <td class="comment"><span>Ctrl + Up</span></td>
      <td class="comment">Upvote</td>
    </tr>
  </table>
</div>
<div id="commments-table">
  <h3>On comments page</h3>
  <table>
    <tr>
      <td class="comment"><span>Up</span></td>
      <td class="comment">Previous comment</td>
    </tr>
    <tr>
      <td class="comment"><span>Down</span></td>
      <td class="comment">Next comment</td>
    </tr>
    <tr>
      <td class="comment"><span>Ctrl + Up</span></td>
      <td class="comment">Upvote comment</td>
    </tr>
    <tr>
      <td class="comment"><span>Space</span></td>
      <td class="comment">Reply to comment in new tab</td>
    </tr>
    <tr>
      <td class="comment"><span>Left</span> or <span>Alt + Left</span></td>
      <td class="comment">Close comment tab and go back to links page</td>
    </tr>
    <tr>
      <td class="comment"><span>Right</span> or <span>n</span></td>
      <td class="comment">Next toplevel comment</td>
    </tr>
    <tr>
      <td class="comment"><span>p</span></td>
      <td class="comment">Previous toplevel comment</td>
    </tr>
    <tr>
      <td class="comment"><span>Enter</span> or <span>o</span></td>
      <td class="comment">Open first link in current comment</td>
    </tr>
  </table>
</div>
<div id="footer">
</div>
</div>
</center>
</div>

<div id="help-link" style="display: none;">
  <a id="open-help" href="#">'?' opens navigation help</a>
</div>