TileLayer with Canvas renderer

TileLayer has 2 renderers: canvas and gl(default). When browser doesn't support webgl(IE9/10), it will switch to canvas automatically.

The differences between them are:

renderer IE9/10 3D CORS required
gl NO YES YES
canvas YES NO NO*

* When exporting map's image by calling map.toDataURL, CORS is required and TileLayer must set crossOrigin in options.

index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>TileLayer and Geo-Projections - TileLayer with Canvas renderer</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.min.js"></script>
  <body>
    <div id="map" class="container"></div>

    <script>
      var map = new maptalks.Map('map', {
        center:     [-0.113049,51.498568],
        zoom:  13,
        baseLayer : new maptalks.TileLayer('base',{
          renderer : 'canvas', // set TileLayer's renderer to canvas
          // crossOrigin : 'anonymous',
          urlTemplate: 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        })
      });

    </script>
  </body>
</html>
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