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chromium/third_party/blink/web_tests/svg/text/vertical-discrete-tspans.html 

<!DOCTYPE html>
<svg width="750" height="550" style="background-color: blue">
  <text writing-mode="tb">
    <tspan x="100" y="50">0</tspan>
    <tspan x="300" y="50">1</tspan>
    <tspan x="500" y="50">2</tspan>
    <tspan x="700" y="50">3</tspan>
    <tspan x="900" y="50">4</tspan>
    <tspan x="1100" y="50">5</tspan>
    <tspan x="1300" y="50">6</tspan>
    <tspan x="1500" y="50">7</tspan>
    <tspan x="1700" y="50">8</tspan>
    <tspan x="1900" y="50">9</tspan>
  </text>
</svg>