Doctype

Why HTML doctype is necessary

Accessibility

Why HTML doctype is necessary

In order to avoid that your page renders in ways you did not expect, you need to specify a doctype.

 

How the SeoChecker doctype audit is displayed

If a page has no <!DOCTYPE html> declaration, SeoChecker will notify it.



Where should I add a doctype declaration?

You need to add the doctype declaration at the top of the HTML document.

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