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chromium/third_party/blink/web_tests/svg/transforms/change-transform-origin-css.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml">

<!--
Verify that changing the SVG transform-origin CSS property attribute works correctly.  Note that
the default transform-origin for an SVG element is 0 0.

The green 100x100 rectangle should appear at 25,25.
-->

<body>
  <svg xmlns="http://www.w3.org/2000/svg" style="position: absolute; top: 0px; left: 0px;">
    <rect id="rect" width="50px" height="50px" x="50" y="50" fill="green"
          style="transform: scale(2, 2); transform-box: fill-box"/>
  </svg>

  <script><![CDATA[
      document.getElementById('rect').style.webkitTransformOrigin = "50% 50%";
  ]]></script>
</body>
</html>