Skip to main content

Reports
HTML Guide
Accessibility Guide
Courses

Check your sites

HTML checks.
A11Y checks.
Schedules.
Muting.
Device emulation.
Fully automated.

Sign up now

HTML Guide for almost standards

Almost standards mode doctype. Expected “<!DOCTYPE html>”.

doctype
almost standards

Rocket Validator checks HTML on your sites using the latest version of W3C Validator Nu HTML Checker, which is intended for HTML5 documents.

The page scanned is using an “almost standards mode” doctype, instead of the expected <!DOCTYPE html>. While the almost standards mode was used in the transition to HTML5, you should consider moving to the HTML5 standard.