lue="p2"><br>
    End point: <input id="simpleEnd" value="p3">
  </p>
  <p>
    <button id="doSimple">Process graph above</button>
  </p>
  <p id="simpleResults">Click button about to see results here
  </p>

  <!--
    <h2>Grid graphs</h2>
    <p>
      Start vertex: <input id="gridStart" value="V-0-0"><br>
      End vertex: <input id="gridEnd" value="V-19-9"> (common syntax: 'V-XX-YY')<br>
      Grid width: <input id="gridWidth" value="20"><br>
      Grid height: <input id="gridHeight" value="10"><br>
   