The Tor Browser / file revision

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 <svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink">

   <title>Test effect on startOffset in em units</title>

   <defs>

     <path id="p" d="M100,100 h200" stroke="red"/>

   </defs>

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

   <text font-size="50" fill="red">

       <textPath xlink:href="#p" startOffset="2em">abc</textPath>

   </text>

   <text x="100" y="100" dx="2em" font-size="50" stroke-width="4" fill="lime" stroke="lime">abc</text>

 </svg>