Page lacks the HTML doctype, thus triggering quirks mode
— Updated
Appears in: Best Practices audits
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:
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.
Resources #
- Source code for Page lacks the HTML doctype, thus triggering quirks mode audit
- Doctype
- Quirks Mode and Standards Mode
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