From http://www.w3schools.com (Copyright Refsnes Data)

SVG <polyline>

The <polyline> tag is used to create any shape that consists of only straight lines.

The <polyline> Tag

The <polyline> tag is used to create any shape that consists of only straight lines.

Copy the following code into Notepad and save the file as "polyline1.svg". Place the file in your Web directory:

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">

<polyline points="0,0 0,20 20,20 20,40 40,40 40,60"
style="fill:white;stroke:red;stroke-width:2"/>

</svg>