 - delete examples that no longer apply.</li>
  <li>Should minimal.css be changed to used relative font sizes? See
  <a href="http://www.w3schools.com/CSS/pr_font_font-size.asp/">http://www.w3schools.com/CSS/pr_font_font-size.asp\</a></li>
  <li>Document behavior of path::replace_extension has change WRT argument w/o a 
  dot.</li>
  <li style="font-size: 10pt">Document leading //: no longer treated specially. 
  But is that really correct?</li>
  <li style="font-size: 10pt">Behavior of root_path() has been