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<!DOCTYPE html>
<html>
<head>
  <script type="text/javascript">
    function doTest() {
      for (var i = 0; i < 10; ++i) {
        // clear target element's content
        document.getElementById("target-table").innerHTML = "";
        // clone and append new row
        cloned_row = document.getElementById("row-template").cloneNode(true);
        document.getElementById("target-table").appendChild(cloned_row);
        document.body.offsetWidth;
      }
    }
    </script>
</head>
<body onload="doTest()">
    <table><tr id="row-template"><td>cloning material</td></tr></table>
    <table id="target-table"><tr><td>target table</td></tr></table>
</body>
</html>