examples/test_drag.html from spritejs/spritejs

examples/test_drag.html
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="/js/spritejs.js"></script>
  <style>
    html,body {
      margin: 0;
      padding: 0;
      background: #201e1e;
      height: 100%;
      width: 100%;
      max-width: 800px;
    }
    #container {
      position: absolute;
      width: 800px;
      height: 800px;
    }
  </style>
</head>
<body>
  <div id="container"></div>
  <script>
    const container = document.getElementById('container');
    const scene = new spritejs.Scene({
      container,
      width: 800,
      height: 800,
    });
    const fglayer = scene.layer('fglayer');

    const block = new spritejs.Block({
      bgcolor: 'red',
      x: 100,
      y: 100,
      size: [200, 200],
    });

    fglayer.append(block);

    fglayer.addEventListener('mousemove', (evt) => {
      block.attr({
        x: evt.x,
        y: evt.y,
      });
    });
  </script>
</body>
</html>