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:
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
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2019-05-02 UTC.
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