Using opacity in SVG graphic
A simple example of using the opacity in SVG graphic.
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<rect x="0" y="0" width="170" height="100" fill="red" />
<circle cx="85" cy="100" r="30" stroke="violet" stroke-width="40" stroke-opacity=".5" fill="green" />
</svg>
</body>
</html>