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chromium/third_party/blink/web_tests/external/wpt/css/css-transforms/transform-box/stroke-box-mutation-004.html 

<!DOCTYPE html>
<html class="reftest-wait">
<title>transform-box: stroke-box, on group (&lt;g>), child shape mutated</title>
<link rel="match" href="reference/svgbox-rect-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-transforms-1/#transform-box">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<meta name="assert" content="This should display a rect whose center of rotation is at (20, 0) of its stroke-box."/>
<style>
#target {
  transform-box: stroke-box;
  transform-origin: 20px 0px;
  transform: rotate(90deg);
}
#target > rect {
  fill: green;
  stroke: black;
  stroke-width: 20;
}
</style>
<svg width="400" height="300">
  <g id="target">
    <rect width="100" height="100" x="100" y="100"/>
  </g>
</svg>
<script>
  waitForAtLeastOneFrame().then(() => {
    const rect = document.querySelector('#target > rect');
    rect.setAttribute('height', '50');
    takeScreenshot();
  });
</script>