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chromium/third_party/blink/web_tests/external/wpt/svg/text/scripted/getextentofchar.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>SVGTextContentElement.getExtentOfChar</title>
<link rel="help" href="https://svgwg.org/svg2-draft/text.html#__svg__SVGTextContentElement__getExtentOfChar">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<svg width="800" height="600">
<text><tspan id="tspan1" x="50 150 100" y="100">abc</tspan></text>
</svg>

<script>
test(() => {
  const element = document.querySelector('#tspan1');
  assert_equals(element.getNumberOfChars(), 3);
  assert_equals(element.getExtentOfChar(0).x, 50);
  assert_equals(element.getExtentOfChar(1).x, 150);
  assert_equals(element.getExtentOfChar(2).x, 100);
}, 'Multiple chunks in a tspan');
</script>