index.html
<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Geometry Styles - Marker with HTML content</title>
<style type="text/css">
html,body{margin:0px;height:100%;width:100%}
.container{width:100%;height:100%}
.text_marker{font:30px bold sans-serif;color:#34495e;text-shadow:2px 0 white;width:160px}
</style>
<link rel="stylesheet" href="https://unpkg.com/maptalks/dist/maptalks.css">
<script type="text/javascript" src="https://unpkg.com/maptalks/dist/maptalks.min.js"></script>
<body>
<div id="map" class="container"></div>
<script>
var map = new maptalks.Map('map', {
center: [-0.113049,51.49856],
zoom: 14,
baseLayer: new maptalks.TileLayer('base', {
urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
subdomains: ["a","b","c","d"],
attribution: '© <a href="http://osm.org">OpenStreetMap</a> contributors, © <a href="https://carto.com/">CARTO</a>'
})
});
var marker = new maptalks.ui.UIMarker([-0.113049,51.49856], {
'draggable' : true,
'single' : false,
'content' : '<div class="text_marker">HTML Marker</div>'
});
marker.addTo(map).show();
</script>
</body>
</html>