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

<!DOCTYPE html>
<title>lengthAdjust content/IDL attribute</title>
<link rel="help" href="https://svgwg.org/svg2-draft/text.html#TextElementLengthAdjustAttribute">
<link rel="help" href="https://svgwg.org/svg2-draft/text.html#__svg__SVGTextContentElement__getComputedTextLength">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<svg>
 <text x="0" y="215" textLength="200">Stretched text</text>
 <text x="0" y="215" textLength="200">Stretched text</text>
</svg>

<script>
test(() => {
  const text = document.querySelectorAll('text')[0];
  assert_equals(text.getAttribute('lengthAdjust'), null);
  assert_equals(text.lengthAdjust.baseVal, SVGTextContentElement.LENGTHADJUST_SPACING);
  assert_equals(text.textLength.baseVal.value, 200);
  let lastLength = text.getComputedTextLength();
  assert_between_exclusive(lastLength, 0, 200);

  text.setAttribute('lengthAdjust', 'spacingAndGlyphs');
  assert_equals(text.lengthAdjust.baseVal, SVGTextContentElement.LENGTHADJUST_SPACINGANDGLYPHS);
  assert_equals(text.textLength.baseVal.value, 200);
  assert_greater_than(text.getComputedTextLength(), lastLength);
}, 'Tests dynamic updates of the "lengthAdjust" content attribute');

test(() => {
  const text = document.querySelectorAll('text')[1];
  assert_equals(text.getAttribute('lengthAdjust'), null);
  assert_equals(text.lengthAdjust.baseVal, SVGTextContentElement.LENGTHADJUST_SPACING);
  assert_equals(text.textLength.baseVal.value, 200);
  let lastLength = text.getComputedTextLength();
  assert_between_exclusive(lastLength, 0, 200);

  text.lengthAdjust.baseVal = SVGTextContentElement.LENGTHADJUST_SPACINGANDGLYPHS;
  assert_equals(text.getAttribute('lengthAdjust'), 'spacingAndGlyphs');
  assert_equals(text.lengthAdjust.baseVal, SVGTextContentElement.LENGTHADJUST_SPACINGANDGLYPHS);
  assert_equals(text.textLength.baseVal.value, 200);
  assert_greater_than(text.getComputedTextLength(), lastLength);
}, 'Tests dynamic updates of the "lengthAdjust" IDL attribute');
</script>