<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
svg polyline{
fill:none;
stroke:red;
stroke-width:2;
}
</style>
</head>
<body>
<svg height="100" width="100">
<polyline points="0,20 20,20 20,40 40,40 40, 60 60,60 60,80 80, 80 80, 100" />
</svg>
</body>
</html>