rs/openlayers.github.io@master/en/v6.14.1/build/ol.js"></script>
    <title>OpenLayers example</title>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script type="text/javascript">
    function a() {
    let lat = 0
    let lon = 0
    let el = new MainWSQueueElement({
        msg: 'getlatlon'
    }, function(msg) {
        if (msg.msg === 'R_getlatlon') {
            return msg.content;
        }
        return null;
    }, 15000, 3);
    el.enqueue().then(process_latlon).catch(function(err) 