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chromium/third_party/blink/web_tests/external/wpt/svg/types/scripted/SVGGraphicsElement.getBBox-02.html 

<!doctype html>
<title>SVGGraphicsElement.prototype.getBBox on &lt;tspan&gt;</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg height="100">
  <text y="180" font-size="100" font-family="Ahem" fill="lightblue"
        transform="translate(0, -100)">X<tspan fill="blue">X</tspan></text>
</svg>
<script>
  async_test(t => {
    onload = t.step_func_done(() => {
      let tspan = document.querySelector('tspan');
      let bbox = tspan.getBBox();
      for (let property of ['x', 'y', 'width', 'height'])
        assert_equals(bbox[property], 100, property);
    });
  });
</script>