demo

<title>Simple Marker</title>
<!-- The callback parameter is required, so we use console.debug as a noop -->
<a href="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY_HERE&callback=console.debug&libraries=maps,marker&v=beta">https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY_HERE&callback=console.debug&libraries=maps,marker&v=beta</a>