Why are Lighthouse and PageSpeed Insights not detecting my HTML doctype and meta tags?-HTML Tutorial-php.cn

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Why are Lighthouse and PageSpeed Insights not detecting my HTML doctype and meta tags?

Patricia Arquette

Apr 05, 2025 pm 12:21 PM

Browsertoola tag

Why are the Lighthouse and PageSpeed Insights performance tests not showing my HTML document type and meta tags?

Many developers will encounter a question when testing web page performance using Lighthouse and PageSpeed Insights: DOCTYPE and<meta> Tags, but the test results show that it is not detected. This article will analyze this problem based on actual cases.

Why are Lighthouse and PageSpeed Insights not detecting my HTML doctype and meta tags?

The screenshots provided by the developer show that the HTML source code contains DOCTYPE declarations and various<meta> Tags (character set, viewport, etc.). However, the Lighthouse and PageSpeed Insights report do not mention these tags. This is not a test tool error.

Although DOCTYPE statement and<meta> Tags are crucial for SEO and web semantics, but they do not directly affect page loading speed. Lighthouse and PageSpeed Insights mainly analyze factors that affect loading speed, such as the number of network requests, resource size, and render blocking. DOCTYPE and<meta> Tags are structural elements of HTML documents that provide context information when the browser parses HTML, and are used to correctly render page content rather than participate in page resource loading and rendering. Therefore, these tools usually do not list them in performance reports.

Test tools focus more on optimisable performance metrics than HTML document structural integrity. Even if these tags are not displayed in the report, it does not mean they do not exist or have problems. Developers should focus on other performance metrics listed in the report, such as first content drawing time (FCP) and maximum content drawing time (LCP) to optimize page loading speed.

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