LayoutTests/svg/text/resources/text-font-invalid.svg

<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xl="http://www.w3.org/1999/xlink" version="1.1">
  <defs>
    <font-face font-family="Arbitrary font not on the system">
    <font-face-src>
      <font-face-name name="VeryUnlikelyToExistFont"/>
    </font-face-src>
    </font-face>
  </defs>
  <g>
    <text>
      <tspan font-family="Arbitrary font not on the system">Foobar</tspan>
    </text>
  </g>
</svg>