HTTP/2 200
date: Sun, 05 Oct 2025 14:14:22 GMT
content-type: text/html; charset=UTF-8
content-encoding: gzip
cache-control: max-age=0, public, s-maxage=3600
access-control-allow-origin: *
last-modified: Sun, 05 Oct 2025 11:45:59 GMT
x-backend: sf-main
x-request-id: 989d86620b74ccbb
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: EXPIRED
set-cookie: __cf_bm=yvVoP_TEDA3IY2weqsm49FfU0Ph1mhosC7EAAyNtckY-1759673662-1.0.1.1-QDuEV3MQxnYHDtmooyhmpDLMGsXZCoqHN5P2ical4O2bwGhnOyiwF0Af9tIE7eve5tVbSHWygvYloHfrbJx7vXoE.pTJdtM9iUXjSJvwxyo; path=/; expires=Sun, 05-Oct-25 14:44:22 GMT; domain=.w3.org; HttpOnly; Secure; SameSite=None
vary: Accept-Encoding
server: cloudflare
cf-ray: 989d86620b74ccbb-BLR
alt-svc: h3=":443"; ma=86400
main element - an HTML5 extension specification publication history | Standards | W3C
Skip to content
main element - an HTML5 extension specification publication history