HTML Checking for Large Sites

Rocket Validator automatically checks your pages on the W3C Validator.

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

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.

Learn more about the “Almost standards mode”:

Related W3C validator issues

50,000 Accessibility and HTML checks per month. Fully automated.

Let our automated scanner check your large sites using Axe Core and W3C Validator.