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Feb 18th, 2018
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  1. <p><a href="slow.html" target="_blank">Open slow page</a></p>
  2. <canvas id="a"></canvas>
  3. <script>
  4. var a = document.getElementById('a');
  5. var c = a.getContext('2d');
  6. (function frame(){
  7. c.clearRect(0, 0, 300, 150);
  8. c.fillRect(Math.cos(Date.now() / 100) * 125 + 125, 0, 50, 50);
  9. requestAnimationFrame(frame);
  10. })();
  11.  
  12. </script>
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