SVG+css3 圆形loading

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<!DOCTYPE html>
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>RunJS</title>
	</head>
	<body>
		<div class="test">
			<svg id="svgForStroke" width="400" height="400" xmlns="http://www.w3.org/2000/svg">
				<circle cx="50%" cy="50%" r="40%" stroke-width="10%"/>
			</svg>
		</div>
	</body>
</html>