<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <title>Testcase for invalid text</title> <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=445687 --> <rect width="100%" height="100%" fill="lime"/> <text x="50" y="50" font-size="30"><tspan><text x="50" y="50" font-size="30">Should not see this</text></tspan></text> </svg>