Styles in CSS files and code in JavaScript files are marked in two colors: Click on a URL to inspect that file in the Sources panel. You can reduce the size of your pages by only shipping the code and styles that you need. When you load or run a page, the tab tells you how much code was used, versus how much was loaded: Chrome DevTools: Coverage tab. Use the Coverage tab in Chrome DevTools to identify non-critical CSS and JS. The first step to reducing the impact of render-blocking resources, is to identify what's critical and what's not. media="all" is considered render-blocking. Does not have a media attribute that matches the user's device specifically.When this attribute is present, the browser does not download the stylesheet. Lighthouse flags two types of render-blocking URLs: scripts and stylesheets. Which URLs get flagged as render-blocking resources? # The goal is to reduce the impact of these render-blocking URLs by inlining critical resources, deferring non-critical resources, and removing anything unused. The Opportunities section of your Lighthouse report lists all URLs blocking the first paint of your page. How to eliminate render-blocking stylesheets.
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