canvas-5-polyfillJS 库
canvas-5-polyfill 是用来在 HTML 5 Canvas 上开发新特征的 Javascript polyfill 库。开发的新特征如：Path2D objects 和 ellipse() on CanvasRenderingContext2D。
用途示例：
<html>
<head>
<title>Test Canvas Polyfill</title>
<script
src='bower_components/canvas-5-polyfill/canvas.js'
type='text/javascript'></script>
</head>
<body>
<canvas id=ID width=500 height=500>
<script type='text/javascript' charset='utf-8'>
var ctx = document.getElementById('ID').getContext('2d');
var p = new Path2D();
p.moveTo(100, 10);
p.lineTo(10, 100);
ctx.strokeStyle = '#555';
ctx.lineWidth = 10;
ctx.stroke(p);
</script>
</body>
</html>
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