<svg width="300" height="200"
  xmlns="http://www.w3.org/2000/svg"
  xmlns:html="http://www.w3.org/1999/xhtml">
  <title>Rectangle coordinates and sizes specified using calc</title>
  <html:link rel="help" href="https://w3c.github.io/svgwg/svg2-draft/geometry.html"/>
  <html:link rel="match"  href="rect-ref.svg" />
  <style>
    rect {
      fill: blue;
      font-size: 40px;
    }
  </style>
  <rect x="calc(80px + 10% - 2em)" y="calc(80px + 30% - 2em)"
    width="calc(8 * 5%)" height="calc(10 * 5%)" />
</svg>