Page lacks the HTML doctype, thus triggering quirks mode

Specifying a doctype prevents the browser from switching to quirks mode, which can cause your page to render in unexpected ways.

How the Lighthouse doctype audit fails

Sitefig flags pages without the <!DOCTYPE html> declaration:

Each Best Practices audit is weighted equally in the Lighthouse Best Practices Score. Learn more in The Best Practices score.

How to add a doctype declaration

Add the <!DOCTYPE html> declaration to the top of your HTML document:

<!DOCTYPE html>
<html lang="en">
…

See MDN's Doctype page for more information.

Sitefig uses Google Lighthouse for code checking. Lighthouse is the leading open source auditing toolkit.

Portions of this page are reproduced from work created and shared by Google and used according to terms described in the Creative Commons 4.0 Attribution License.