<!DOCTYPE html> <!-- Any copyright is dedicated to the Public Domain. - http://creativecommons.org/publicdomain/zero/1.0/ --> <html class="reftest-wait"> <script> function runTest() { /* Clicking on second summary should not collapse details. */ var summary = document.getElementById("summary"); summary.dispatchEvent(new MouseEvent("click")); document.documentElement.removeAttribute("class"); } </script> <body onload="runTest();"> <details open> <summary>Summary</summary> <summary id="summary">Second Summary</summary> <p>This is the details.</p> </details> </body> </html>