<?xml version="1.0" encoding="UTF-8"?>
<svg width="120" height="120" xmlns="http://www.w3.org/2000/svg">
<style>
#test {
fill: transparent;
stroke: black;
stroke-width: 10;
stroke-linecap: square;
}
</style>
<path id="test" d="m 40,5 h 40 c 19.39,0 35,15.61 35,35 v 40 c 0,19.39 -15.61,35 -35,35 H 40 L 5,80 V 40 Z" />
</svg>