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chromium/third_party/blink/web_tests/external/wpt/svg/coordinate-systems/svgtransformlist-replaceitem.html 

<!DOCTYPE HTML>
<link rel="help" href="https://svgwg.org/svg2-draft/coords.html#InterfaceSVGTransformList">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>

<svg width="800" height="600" xmlns="http://www.w3.org/2000/svg">
<text id="text" x="200" y="200"
      transform="scale(1) translate(0 0)">123</text>
<text id="ref" x="200" y="200"
      transform="scale(10 1) translate(0 0)">123</text>
</svg>

<script>
test(() => {
  const referenceBox = document.querySelector('#ref').getBBox();
  const root = document.querySelector('svg');
  const text = document.querySelector('#text');

  // Make the transform of #text same as #ref.
  const scale = root.createSVGTransform();
  scale.setScale(10, 1);
  text.transform.baseVal.replaceItem(scale, 0);

  const box = text.getBBox();
  assert_equals(box.y, referenceBox.y);
  assert_equals(box.height, referenceBox.height);
}, 'Dynamic update of transform; replaceItem()');
</script>
</body>