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https://developer.chrome.com/docs/lighthouse/best-practices/doctype Page lacks the HTML doctype, thus triggering quirks mode | Lighthouse | Chrome for Developers May 2, 2019 - Learn how to make sure your page doesn't trigger quirks mode in older browsers. chrome for developers the html quirks mode https://quirks.spec.whatwg.org/ Quirks Mode Standard quirks mode standard https://bugzilla.validator.nu/show_bug.cgi?id=541 Bug 541 – Propagate the quirks mode to the fragment parser in preparation to speccing the parsing... quirks mode in preparation bug propagate https://webglossary.info/terms/quirks-mode/ Quirks mode · WebGlossary.info · Uncover Your Unknowns in Web Development quirks mode web development info uncover