google lighthouse
A new tool by Google is to test and give you the recommendation to improve performance, SEO, security, best practices, and accessibility.
Google recently launched Lighthouse, an open-source tool to audit your website manually and automatically.
There are more than 75 metrics it tests and gives you overall scoring. Some of the following popular one you might be interested in as a site owner, SEO analyst, webmasters.
Its fantastic tool and you can use in multiple ways.
That’s right – so many ways. If you are a developer, you can use it with Node.js to run a test programmatically. There are already few tools in the market powered by Lighthouse who offer continuous site performance monitoring.
Let’s find out how you run lighthouse test against your site.
Start from the easiest one.
Google released web.dev a few months back and gained good popularity. Testing online is easy.
Go to Measure page and enter the URL to run the audit. It will take a few seconds, and you should see the detailed reporting with the overall scoring.
Results also show the success metrics test so well done for the passed audits and work on those needs attention.
Don’t spend too much time getting 100. Even Google’s sites don’t score that.
Consider them as guidelines and try to improve as much you can.
Note: web.dev emulate a test using a Mobile device, and while writing, I don’t see an option to test using Desktop.
Do you know Lighthouse is available in your Chrome browser? And, the great news is, you can choose to test using Mobile or Desktop. It’s available in Developer tools.
As you can see above, you have an option to choose what you want to test. This is great as you can focus on your goal and get the audit results faster.
Results look and feel from Chome and web.dev is almost similar.
But if you look at carefully, there is one extra metrics group here – Progressive Web App. So another reason to audit using Chrome.
Lighthouse is available as a Node module. You can get it installed on your server and use it programmatically or command line. Let’s quickly check out how to install Lighthouse to run some test.
The following, I’ve tested on DigitalOcean server. Lighthouse requires Node LTS 8.9 or later and I assume you already have it installed. If not, refer to this Node.js installation guide.
You will also require chromium browser to be installed on the server. I covered the installation instruction here.
Installing Lighthouse is straightforward, as you do other modules.
npm install -g lighthouse
I am using -g
here so it get installed as global module.
root@geekflarelab:~# npm install -g lighthouse
/usr/bin/lighthouse -> /usr/lib/node_modules/lighthouse/lighthouse-cli/index.js
/usr/bin/chrome-debug -> /usr/lib/node_modules/lighthouse/lighthouse-core/scripts/manual-chrome-launcher.js
> axe-core@3.1.2 postinstall /usr/lib/node_modules/lighthouse/node_modules/axe-core
> node build/utils/postinstall.js
+ lighthouse@4.0.0
added 179 packages from 119 contributors in 10.094s
root@geekflarelab:~#
Once installed, run lighthouse
command to ensure it has installed correctly.
root@geekflarelab:~# lighthouse
Please provide a url
Specify --help for available options
root@geekflarelab:~#
Good, lighthouse is ready to run the audit. Let’s try some test options.
To run a test using a headless browser
lighthouse URL --chrome-flags="--headless"
You need to provide an absolute URL including http or https.
Ex:
chandan@geekflarelab:~$ lighthouse https://geekflare.com --chrome-flags="--headless"
ChromeLauncher Waiting for browser. +0ms
ChromeLauncher Waiting for browser... +1ms
ChromeLauncher Waiting for browser..... +511ms
ChromeLauncher Waiting for browser.....✓ +2ms
status Connecting to browser +176ms
status Resetting state with # +24ms
status Benchmarking machine +30ms
status Initializing… +508ms
status Loading page & waiting for onload Scripts, CSSUsage, Viewport, ViewportDimensions, ThemeColor, Manifest, RuntimeExceptions, ChromeConsoleMessages, ImageUsage, Accessibility, LinkElements, AnchorsWithNoRelNoopener, AppCacheManifest, Doctype, DOMStats, JSLibraries, OptimizedImages, PasswordInputsWithPreventedPaste, ResponseCompression, TagsBlockingFirstPaint, MetaDescription, FontSize, CrawlableLinks, MetaRobots, Hreflang, EmbeddedContent, Canonical, RobotsTxt +27ms
status Retrieving in-page: Scripts +2s
status Retrieving in-page: CSSUsage +0ms
status Retrieving in-page: Viewport +0ms
status Retrieving in-page: ViewportDimensions +0ms
status Retrieving in-page: ThemeColor +0ms
status Retrieving in-page: Manifest +0ms
status Retrieving in-page: RuntimeExceptions +0ms
status Retrieving in-page: ChromeConsoleMessages +0ms
status Retrieving in-page: ImageUsage +0ms
status Retrieving in-page: Accessibility +0ms
status Retrieving in-page: LinkElements +0ms
status Retrieving in-page: AnchorsWithNoRelNoopener +1ms
status Retrieving in-page: AppCacheManifest +0ms
status Retrieving in-page: Doctype +0ms
status Retrieving in-page: DOMStats +0ms
status Retrieving in-page: JSLibraries +0ms
status Retrieving in-page: OptimizedImages +0ms
status Retrieving in-page: PasswordInputsWithPreventedPaste +0ms
status Retrieving in-page: ResponseCompression +0ms
status Retrieving in-page: TagsBlockingFirstPaint +0ms
status Retrieving in-page: MetaDescription +0ms
status Retrieving in-page: FontSize +0ms
status Retrieving in-page: CrawlableLinks +0ms
status Retrieving in-page: MetaRobots +0ms
status Retrieving in-page: Hreflang +0ms
status Retrieving in-page: EmbeddedContent +0ms
status Retrieving in-page: Canonical +0ms
status Retrieving in-page: RobotsTxt +0ms
status Retrieving trace +1ms
status Retrieving devtoolsLog & network records +110ms
status Retrieving: Scripts +27ms
status Retrieving: CSSUsage +53ms
status Retrieving: Viewport +192ms
status Retrieving: ViewportDimensions +5ms
status Retrieving: ThemeColor +13ms
status Retrieving: Manifest +2ms
status Retrieving: RuntimeExceptions +295ms
status Retrieving: ChromeConsoleMessages +1ms
status Retrieving: ImageUsage +2ms
status Retrieving: Accessibility +22ms
status Retrieving: LinkElements +526ms
status Retrieving: AnchorsWithNoRelNoopener +10ms
status Retrieving: AppCacheManifest +6ms
status Retrieving: Doctype +20ms
status Retrieving: DOMStats +4ms
status Retrieving: JSLibraries +50ms
status Retrieving: OptimizedImages +25ms
status Retrieving: PasswordInputsWithPreventedPaste +234ms
status Retrieving: ResponseCompression +3ms
status Retrieving: TagsBlockingFirstPaint +7ms
status Retrieving: MetaDescription +6ms
status Retrieving: FontSize +7ms
status Retrieving: CrawlableLinks +245ms
status Retrieving: MetaRobots +6ms
status Retrieving: Hreflang +2ms
status Retrieving: EmbeddedContent +2ms
status Retrieving: Canonical +3ms
status Retrieving: RobotsTxt +6ms
status Resetting state with # +19ms
status Loading page & waiting for onload ServiceWorker, Offline, StartUrl +24ms
status Retrieving in-page: ServiceWorker +59ms
status Retrieving in-page: Offline +0ms
status Retrieving in-page: StartUrl +1ms
status Retrieving devtoolsLog & network records +0ms
status Retrieving: ServiceWorker +2ms
status Retrieving: Offline +1ms
status Retrieving: StartUrl +1ms
status Resetting state with # +5ms
status Loading page & waiting for onload HTTPRedirect, HTMLWithoutJavaScript +48ms
status Retrieving in-page: HTTPRedirect +260ms
status Retrieving in-page: HTMLWithoutJavaScript +0ms
status Retrieving devtoolsLog & network records +0ms
status Retrieving: HTTPRedirect +7ms
status Retrieving: HTMLWithoutJavaScript +12ms
status Disconnecting from browser... +7ms
status Analyzing and running audits... +6ms
status Evaluating: Uses HTTPS +3ms
status Evaluating: Redirects HTTP traffic to HTTPS +24ms
status Evaluating: Registers a service worker that controls page and start_url +1ms
status Evaluating: Current page responds with a 200 when offline +0ms
status Evaluating: Has a `<meta name="viewport">` tag with `width` or `initial-scale` +1ms
status Evaluating: Contains some content when JavaScript is not available +1ms
status Evaluating: First Contentful Paint +6ms
status Evaluating: First Meaningful Paint +54ms
status Evaluating: Page load is fast enough on mobile networks +10ms
status Evaluating: Speed Index +33ms
status Evaluating: Screenshot Thumbnails +529ms
status Evaluating: Final Screenshot +287ms
status Evaluating: Estimated Input Latency +2ms
status Evaluating: No browser errors logged to the console +16ms
status Evaluating: Server response times are low (TTFB) +1ms
status Evaluating: First CPU Idle +1ms
status Evaluating: Time to Interactive +30ms
status Evaluating: User Timing marks and measures +0ms
status Evaluating: Minimize Critical Requests Depth +2ms
status Evaluating: Avoid multiple page redirects +3ms
status Evaluating: Web app manifest meets the installability requirements +2ms
status Evaluating: Configured for a custom splash screen +1ms
status Evaluating: Sets an address-bar theme color +0ms
status Evaluating: Content is sized correctly for the viewport +1ms
status Evaluating: Displays images with correct aspect ratio +0ms
status Evaluating: Avoids deprecated APIs +1ms
status Evaluating: Minimizes main-thread work +0ms
status Evaluating: JavaScript execution time +11ms
status Evaluating: Preload key requests +3ms
status Evaluating: Preconnect to required origins +2ms
status Evaluating: All text remains visible during webfont loads +2ms
status Evaluating: Network Requests +1ms
status Evaluating: Metrics +2ms
status Evaluating: start_url responds with a 200 when offline +1ms
status Evaluating: Site works cross-browser +1ms
status Evaluating: Page transitions don't feel like they block on the network +0ms
status Evaluating: Each page has a URL +0ms
status Evaluating: `[aria-*]` attributes match their roles +1ms
status Evaluating: `[role]`s have all required `[aria-*]` attributes +1ms
status Evaluating: Elements with `[role]` that require specific children `[role]`s, are present +0ms
status Evaluating: `[role]`s are contained by their required parent element +1ms
status Evaluating: `[role]` values are valid +1ms
status Evaluating: `[aria-*]` attributes have valid values +0ms
status Evaluating: `[aria-*]` attributes are valid and not misspelled +1ms
status Evaluating: `<audio>` elements contain a `<track>` element with `[kind="captions"]` +1ms
status Evaluating: Buttons have an accessible name +1ms
status Evaluating: The page contains a heading, skip link, or landmark region +1ms
status Evaluating: Background and foreground colors have a sufficient contrast ratio +1ms
status Evaluating: `<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>` or `<template>` elements. +1ms
status Evaluating: Definition list items are wrapped in `<dl>` elements +0ms
status Evaluating: Document has a `<title>` element +1ms
status Evaluating: `[id]` attributes on the page are unique +1ms
status Evaluating: `<frame>` or `<iframe>` elements have a title +1ms
status Evaluating: `<html>` element has a `[lang]` attribute +0ms
status Evaluating: `<html>` element has a valid value for its `[lang]` attribute +1ms
status Evaluating: Image elements have `[alt]` attributes +1ms
status Evaluating: `<input type="image">` elements have `[alt]` text +1ms
status Evaluating: Form elements have associated labels +0ms
status Evaluating: Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute. +1ms
status Evaluating: Links have a discernible name +1ms
status Evaluating: Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`). +1ms
status Evaluating: List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements +1ms
status Evaluating: The document does not use `<meta http-equiv="refresh">` +0ms
status Evaluating: `[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5. +1ms
status Evaluating: `<object>` elements have `[alt]` text +1ms
status Evaluating: No element has a `[tabindex]` value greater than 0 +1ms
status Evaluating: Cells in a `<table>` element that use the `[headers]` attribute only refer to other cells of that same table. +1ms
status Evaluating: `<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe. +0ms
status Evaluating: `[lang]` attributes have a valid value +1ms
status Evaluating: `<video>` elements contain a `<track>` element with `[kind="captions"]` +1ms
status Evaluating: `<video>` elements contain a `<track>` element with `[kind="description"]` +1ms
status Evaluating: `[accesskey]` values are unique +1ms
status Evaluating: Custom controls have associated labels +0ms
status Evaluating: Custom controls have ARIA roles +1ms
status Evaluating: User focus is not accidentally trapped in a region +0ms
status Evaluating: Interactive controls are keyboard focusable +0ms
status Evaluating: Headings don't skip levels +0ms
status Evaluating: Interactive elements indicate their purpose and state +1ms
status Evaluating: The page has a logical tab order +0ms
status Evaluating: The user's focus is directed to new content added to the page +1ms
status Evaluating: Offscreen content is hidden from assistive technology +0ms
status Evaluating: HTML5 landmark elements are used to improve navigation +0ms
status Evaluating: Visual order on the page follows DOM order +0ms
status Evaluating: Uses efficient cache policy on static assets +1ms
status Evaluating: Avoids enormous network payloads +3ms
status Evaluating: Defer offscreen images +1ms
status Evaluating: Eliminate render-blocking resources +12ms
status Evaluating: Minify CSS +28ms
status Evaluating: Minify JavaScript +64ms
status Evaluating: Defer unused CSS +69ms
status Evaluating: Serve images in next-gen formats +12ms
status Evaluating: Efficiently encode images +11ms
status Evaluating: Enable text compression +6ms
status Evaluating: Properly size images +6ms
status Evaluating: Use video formats for animated content +7ms
status Evaluating: Avoids Application Cache +11ms
status Evaluating: Page has the HTML doctype +0ms
status Evaluating: Avoids an excessive DOM size +1ms
status Evaluating: Links to cross-origin destinations are safe +2ms
status Evaluating: Avoids requesting the geolocation permission on page load +1ms
status Evaluating: Avoids `document.write()` +0ms
status Evaluating: Avoids front-end JavaScript libraries with known security vulnerabilities +0ms
status Evaluating: Detected JavaScript libraries +9ms
status Evaluating: Avoids requesting the notification permission on page load +1ms
status Evaluating: Allows users to paste into password fields +0ms
status Evaluating: Uses HTTP/2 for its own resources +0ms
status Evaluating: Uses passive listeners to improve scrolling performance +1ms
status Evaluating: Document has a meta description +0ms
status Evaluating: Page has successful HTTP status code +1ms
status Evaluating: Document uses legible font sizes +5ms
status Evaluating: Links have descriptive text +1ms
status Evaluating: Page isn’t blocked from indexing +1ms
status Evaluating: robots.txt is valid +2ms
status Evaluating: Document has a valid `hreflang` +1ms
status Evaluating: Document avoids plugins +1ms
status Evaluating: Document has a valid `rel=canonical` +0ms
status Evaluating: Page is mobile friendly +1ms
status Evaluating: Structured data is valid +0ms
status Generating results... +0ms
ChromeLauncher Killing Chrome instance 7098 +59ms
Printer html output written to /home/chandan/geekflare.com_2019-01-20_19-29-35.report.html +46ms
CLI Protip: Run lighthouse with `--view` to immediately open the HTML report in your browser +1ms
In the second last line, you can see it has printed the path where I can find the report. By default, it will generate a report in HTML format which you can view either by downloading on your PC or serve it through some web server.
But, what if you have to generate a report in JSON format?
It’s doable as the following.
lighthouse URL --chrome-flags="--headless" --output json --output-path URL.json
By using Lighthouse CLI, you are in full control to use the way you want it. I would strongly recommend to check out the GitHub repository to learn more about using CLI or programmatically.
Google Lighthouse looks promising tool to perform a continuity test to improve site performance and usability. If you are using WordPress and looking to make your site loads faster then check out Rocket.
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