test_multiple_font_size.html

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<!DOCTYPE HTML>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1370646">Mozilla Bug 1370646</a>

<svg xmlns="http://www.w3.org/2000/svg" width="440" height="100" viewBox="0 0 440 100">

  <text>

    <tspan id="a" style="font-size:100px">3</tspan>

  </text>

  <text>

    <tspan id="b" style="font-size:100px">3</tspan>

    <tspan style="font-size:0.1px">0</tspan>

  </text>

</svg>

<script type="application/javascript">

  SimpleTest.waitForExplicitFinish();

  let alen = document.getElementById("a").getComputedTextLength(),

      blen = document.getElementById("b").getComputedTextLength();

  SimpleTest.isfuzzy(alen, blen, 5, "lengths should be close");

  SimpleTest.finish();

</script>