fill-opacity (and possibly others) are not inherited

[Johannes Rössel]

<?xml version="1.0" encoding="UTF-8"?>
<svg width="100" height="100" version="1.1" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <g fill-opacity="0">
    <path d="m0 0h76v76h-7z" />
  </g>
</svg>