<!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 last child of the <details>. var summary = document.createElement("summary"); var text = document.createTextNode("Summary"); summary.appendChild(text); var details = document.getElementById("details"); details.appendChild(summary); document.documentElement.removeAttribute("class"); } </script> <body onload="runTest();"> <details open id="details"> <p>This is the details.</p> </details> </body> </html>