h
   properties that control various logging options:
</p>
<ul>
   <li><tt>bufSize:</tt> a number setting the size in bytes of the memory
   area reserved for the log messages.  When the memory fills up, the
   oldest messages are discarded as needed to make room for new messages,
   so this sets a limit on how far back in time the log can go.

   <li><tt>filter:</tt> a string, in double quotes, giving a list of
   the messages types to include in the log.  The logger assigns each
   message a type, such as