The list below explains how to get the JSON output, depending on what Lighthouse workflow you're using: The Lighthouse Viewer needs the JSON output of a Lighthouse report. The Lighthouse Viewer # Share reports as JSON Use the Lighthouse Viewer to view and share reports online. Lighthouse runs its audits against the currently-focused page, then opens up a new tab with a report of the results. The Lighthouse extension panelĬlick Generate report. After clicking, the Lighthouse menu expands. If not, open Chrome's extension menu and access it from there. It should be next to the Chrome address bar. In Chrome, go to the page you want to audit.Ĭlick the Lighthouse. Install the Lighthouse Chrome Extension from the Chrome Webstore.The DevTools workflow allows for testing local sites and authenticated pages, while the extension does not. Unless you have a specific reason, you should use the Chrome DevTools workflow rather than this Chrome Extension workflow. See Using programmatically for an example of running Lighthouse programmatically, as a Node module. To see all the options: lighthouse -help # Run the Node module programmatically The -g flag installs it as a global module. Install the current Long-Term Support version of Node.# Install and run the Node command line tool After 30 to 60 seconds, Lighthouse gives you a report on the page. DevTools shows you a list of audit categories. To the right is the Lighthouse panel of Chrome DevTools, which is powered by LighthouseĬlick Analyze page load. To the left is the viewport of the page that will be audited. You can audit any URL on the web.Ĭlick the Lighthouse tab. In Google Chrome, go to the URL you want to audit. Lighthouse has its own panel in Chrome DevTools. None, both the starting and ending tag are mandatory.Īny element that allows embedded content.The CLI and Node workflows require you to have an instance of Google Chrome installed on your machine. Content categoriesįlow content, phrasing content, embedded content This lets browsers opt for lower-density versions in data-saving modes, and you don't have to write explicit media conditions. If providing higher-density versions of an image for high-DPI (Retina) display, use srcset on the element instead. Saving bandwidth and speeding page load times by loading the most appropriate image for the viewer's display.A list of supported image formats can be found in: Image file type and format guide. Note: For example, newer formats like AVIF or WEBP have many advantages, but might not be supported by the browser. Allowing cross-origin use of images and canvas.HTML table advanced features and accessibility.From object to iframe - other embedding technologies.
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