<!doctype html>
<html><head>
    <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
    <script src="mqttws31.js" type="text/javascript"></script>

    <style>
      #cnvs {
          border: none;
          -moz-border-radius: 4px;
          cursor: url(pencil.cur),crosshair;
          position: absolute;
          overflow: hidden;
          width: 100%;
          height: 100%;
      }
      #cnvs:active {
          cursor: url(pencil.cur),crosshair;
      }
      body {
          overflo