<svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml">
  <title>Width and Height (in viewport units) as presentation attributes on rect</title>
  <html:link rel="help" href="https://w3c.github.io/svgwg/svg2-draft/styling.html#TermPresentationAttribute"/>
  <html:link rel="match"  href="rect-sizing-viewport-units-expected.svg" />
    <rect style="width:10vw;height:10vh;" fill="green" />
</svg>