<!docType html>
<html>
<head>
<title>svg demo</title>
<style>
.circle {
fill: rgb(0, 255, 0);
fill-opacity: 0.7;
stroke-width: 2px;
stroke: rgb(100, 100, 100)
}
</style>
</head>
<body>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<!--
圆形
cx,cy:圆心坐标
r:半径
-->
<circle cx="100" cy="50" r="20" class="circle"></circle>>
</svg>
</body>
</html>