<!DOCTYPE html> <!-- Any copyright is dedicated to the Public Domain. - http://creativecommons.org/publicdomain/zero/1.0/ --> <html> <style> details { display: inline; } summary { /* Hide the triangle for comparing with div in reftest. */ list-style-type: none; } </style> <body> Details element: <details open> <summary>Summary</summary> <p>This is the details.</p> </details> </body> </html>