chromium/third_party/blink/web_tests/svg/text/tspan-multiple-outline-vertical.svg

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="600">
  <style>
    text { font: 32px sans-serif; }
    tspan { outline: 1px solid black; }
  </style>
  <text x="10" y="10" writing-mode="tb">
    <tspan dx="1.5em">tspan1</tspan>
    <tspan dx="1.5em">tspan2</tspan>
  </text>
</svg>