Leaflet showing CartoDB positron

A basic leaflet map with CartoDB positron tiles. At some point in the past decade they introduced API keys

<html>
<head>
   <title>Leaflet showing CartoDB positron</title>
   <link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.3/dist/leaflet.css" />
   <script src="https://unpkg.com/leaflet@1.0.3/dist/leaflet.js"></script>
   
   <style>
   #map { height: 180px; }
   </style>
   
   <script language="javascript">
      function init() {
      	 var map = L.map('map').setView([51.505, -0.09], 13);
      	 
      	 //CartoDB layer names: light_all / dark_all / light_nonames / dark_nonames
      	 var layer = L.tileLayer('http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
            attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, &copy; <a href="http://cartodb.com/attributions">CartoDB</a>'
         });
      	 
         layer.addTo(map);
         map.attributionControl.setPrefix(''); // Don't show the 'Powered by Leaflet' text. Attribution overload
      }
   </script>
   
</head>
<body onLoad="javascript:init();">
   <div id="map"></div>
   
</body>                                                                                                                          
</html>

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Harry Wood

Leaflet showing CartoDB positron