Page lacks the HTML doctype, thus triggering quirks mode
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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
Lighthouse 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.
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