dynamic-add-first-summary.html

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<!DOCTYPE html>

<!-- Any copyright is dedicated to the Public Domain.

   - http://creativecommons.org/publicdomain/zero/1.0/ -->

<html class="reftest-wait">

  <script>

  function runTest() {

    // Insert a <summary> as the first child of the <details>.

    var summary = document.createElement("summary");

    var text = document.createTextNode("Summary");

    summary.appendChild(text);

    var details = document.getElementById("details");

    details.insertBefore(summary, details.children[0]);

    document.documentElement.removeAttribute("class");

  </script>

  <body onload="runTest();">

    <details open id="details">

      <summary>Second Summary</summary>

      <p>This is the details.</p>

    </details>

  </body>

</html>