JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://maps.google.com/maps/api/js?sensor=false&amp;.js"></script>
<script src="https://google-maps-utility-library-v3.googlecode.com/svn-history/r300/trunk/maplabel/src/maplabels-compiled.js"></script>
<script src="http://google-maps-utility-library-v3.googlecode.com/svn/tags/markermanager/1.2/markermanager_packed.js"></script>
<div id="map"></div>

CSS

#map{
    width: 450px;
    height: 400px;
}

JavaScript

var map;
var mgr;
var elevator;
var myOptions = {
    zoom: 6,
    center: new google.maps.LatLng(46.87916, -3.32910),
    mapTypeId: 'terrain'
};
map = new google.maps.Map(document.getElementById('map'), myOptions);
mgr = new MarkerManager(map);	

var marker = new google.maps.Marker({
	title: 'No manager',
    position: new google.maps.LatLng(46.87916, -3.32910),
    map: map,
    draggable: true
});

var mapLabel = new MapLabel({
    text: 'No manager'
});

mapLabel.bindTo('position', marker);
mapLabel.bindTo('map', marker);

var marker2 = new google.maps.Marker({
	title: 'With manager',
    position: new google.maps.LatLng(44.87916, -3.32910),
    map: map,
    draggable: true
});

var mapLabel2 = new MapLabel({
    text: 'With manager'
});

mapLabel2.bindTo('map', marker2);
mapLabel2.bindTo('position', marker2);

google.maps.event.addListenerOnce(map, 'idle', function() {
    mgr.addMarker(marker2, 1);
});