HTTP/2 200 date: Mon, 06 Oct 2025 11:05:25 GMT content-type: text/html; charset=utf-8 content-encoding: gzip content-location: 51.html vary: negotiate,Accept-Encoding tcn: choice last-modified: Mon, 08 Mar 2010 18:09:28 GMT cache-control: max-age=21600 expires: Mon, 06 Oct 2025 17:05:25 GMT x-backend: www-mirrors x-request-id: 98a4aefa5f99ad8b strict-transport-security: max-age=15552000; includeSubdomains; preload content-security-policy: frame-ancestors 'self' https://cms.w3.org/ https://cms-dev.w3.org/; upgrade-insecure-requests cf-cache-status: BYPASS set-cookie: __cf_bm=aWqfuQHAaMJwGHxHwZsWmDcGXDcPU7etV4AtJ1DLC98-1759748725-1.0.1.1-RexzP42SWwGNoD4tItoE3PNFQz8EUqaZq.PWaT4EcrNJiaJBjZmEW54WeNB8sZTRwn_C4p35JY8hbIaHw7QfD4lMFxuTcO7dX56kqwlIM68; path=/; expires=Mon, 06-Oct-25 11:35:25 GMT; domain=.w3.org; HttpOnly; Secure; SameSite=None server: cloudflare cf-ray: 98a4aefa5f99ad8b-BLR alt-svc: h3=":443"; ma=86400