The Tor Browser / file revision

 <!--

      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>Test text with zero font-size</title>

   <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=732819 -->

   <rect width="100%" height="100%" fill="lime"/>

   <text x="10" y="50" font-size="0">Some

     <tspan dy="30">text</tspan>

     that should not show.

   </text>

 </svg>