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- <p><a href="slow.html" target="_blank">Open slow page</a></p>
- <canvas id="a"></canvas>
- <script>
- var a = document.getElementById('a');
- var c = a.getContext('2d');
- (function frame(){
- c.clearRect(0, 0, 300, 150);
- c.fillRect(Math.cos(Date.now() / 100) * 125 + 125, 0, 50, 50);
- requestAnimationFrame(frame);
- })();
- </script>
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