<!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 <p> before <summary>. var paragraph = document.createElement("p"); var details_text = document.createTextNode("This is the details."); paragraph.appendChild(details_text); var details = document.getElementById("details"); details.insertBefore(paragraph, details.children[0]); document.documentElement.removeAttribute("class"); } </script> <body onload="runTest();"> <details id="details"> <summary>Summary</summary> </details> </body> </html>