<?xml version="1.0"?>
<svg xmlns="http://www.w3.org/2000/svg" version="1.2"
      viewport-fill="red" baseProfile="tiny">
      <desc>
      Everything here has a red background.
      The rectangle is not filled, so the red background will show through
      </desc>
      <rect x="20" y="20" width="100" height="100" fill="none" stroke="black"/>
</svg>