<header>
  <div class="title">$<project_name>: $<title></div>
</header>
<nav class="mainmenu" title="Main Menu">
  <th1>
    html "<a id='hbbtn' href='$home/sitemap' aria-label='Site Map'>&#9776;</a>"
    builtin_request_js hbmenu.js
    foreach {name url expr class} $mainmenu {
      if {![capexpr $expr]} continue
      if {[string match /* $url]} {set url $home$url}
      html "<a href='$url' class='$class'>$name</a>\n"
    }
  </th1>
</nav>
<nav id="hbdrop" class='hbdrop' title="sitemap"></nav>
