B — https://www.kernel.org | BeaverCheck Audit

Site Health

Score: 80 / 100

Based on 8 categories, 0 sections

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

Top Priorities (5)

No <main> landmark found

Accessibility › Landmark Structure

Cross-Origin-Embedder-Policy header is missing

Security › Security Headers

Cross-Origin-Opener-Policy header is missing

Security › Security Headers

HSTS is missing includeSubDomains

Security › Security Headers

No DMARC record found

Security › Email Security

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fwww.kernel.org)](https://beavercheck.com/results/29f8bb8a-a8d3-3035-931e-23cec1725186)

HTML

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

100

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

904 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.20 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

904 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.20 s

Detailed Report

Audit breakdown by category with detailed findings.

100

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
www.kernel.org/theme/fonts/oswald-regular-webfont.woff2	0.0 ms	20.2 KiB
www.kernel.org/theme/fonts/oxygen-regular-webfont.woff2	0.0 ms	19.6 KiB
www.kernel.org/theme/images/logos/serverscom.svg	0.0 ms	8.0 KiB
www.kernel.org/theme/images/logos/tux.png	0.0 ms	7.7 KiB
www.kernel.org/theme/css/normalize.css	0.0 ms	7.4 KiB
www.kernel.org/theme/css/main.css	0.0 ms	6.5 KiB
www.kernel.org/theme/images/logos/akamai.png	0.0 ms	4.7 KiB
www.kernel.org/theme/images/logos/redhat-community.png	0.0 ms	3.3 KiB
www.kernel.org/theme/images/logos/google.png	0.0 ms	3.0 KiB
www.kernel.org/theme/images/logos/thelinuxfoundation.png	0.0 ms	2.6 KiB
www.kernel.org/theme/images/logos/constellix-green-logo.png	0.0 ms	2.4 KiB
www.kernel.org/theme/images/logos/fastly-logo.png	0.0 ms	1.7 KiB
www.kernel.org/theme/images/icons/downloadarrow_small.png	0.0 ms	1.1 KiB

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

URL	Est Savings
www.kernel.org/theme/fonts/oswald-regular-webfont.woff2	145 ms
www.kernel.org/theme/fonts/oxygen-regular-webfont.woff2	145 ms

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size	Duration
www.kernel.org/theme/css/normalize.css	7.4 KiB	150 ms
www.kernel.org/theme/css/main.css	6.5 KiB

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
body#index > header#banner > div#tux-gear `body#index > header#banner > div#tux-gear`	www.kernel.org/theme/images/logos/tux.png	7.5 KiB	5.5 KiB

Tap interactions may be delayed by up to 300 ms if the viewport is not optimized for mobile.

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Estimated savings: 150 ms 5.5 KiB

URL	Transfer Size	Est Savings
www.kernel.org/theme/css/normalize.css	7.4 KiB	5.5 KiB

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Time to Interactive 1.2 s

●Max Potential First Input Delay 20 ms

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 95 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.3 s

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 0 ms

●Server Backend Latencies 0 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 0 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Failing Elements
About `nav > ul > li > a`
Contact us `nav > ul > li > a`
FAQ `nav > ul > li > a`
Releases `nav > ul > li > a`
Signatures `nav > ul > li > a`
Site news `nav > ul > li > a`
This site is operated by the Linux Kernel Organization, a 501(c)3 nonprofit cor… `body#index > footer#contentinfo > address#about`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Failing Elements
501(c)3 nonprofit corporation `body#index > footer#contentinfo > address#about > a`

These are opportunities to improve the legibility of your content.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Failing Elements
HTTP `tbody > tr > td > a`
https://www.kernel.org/pub/ `tbody > tr > td > a`
GIT `tbody > tr > td > a`
https://git.kernel.org/ `tbody > tr > td > a`
RSYNC `tbody > tr > td > a`
Git Trees `div.blogroll > ul > li > a`
Patchwork `div.blogroll > ul > li > a`
Wikis `div.blogroll > ul > li > a`
Bugzilla `div.blogroll > ul > li > a`
Mirrors `div.blogroll > ul > li > a`
Linux.com `div.blogroll > ul > li > a`
Site Atom feed `div.social > ul > li > a`
Releases Atom Feed `div.social > ul > li > a`
Kernel Planet `div.social > ul > li > a`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Failing Elements
html `html`

These items highlight common accessibility best practices.

Screen readers have features to make navigating tables easier. Ensuring that `<td>` elements in a large table (3 or more cells in width and height) have an associated table header may improve the experience for screen reader users. Learn more about table headers.

Failing Elements
mainline: 7.0-rc7 2026-04-05 [tarball] [patch] [inc. patch] [view diff] [brows… `body#index > aside#featured > article > table#releases`

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●Image elements have `[alt]` attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

●Heading elements appear in a sequentially-descending order

●Identical links have the same purpose.

●Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA attributes are used as specified for the element's role

○Deprecated ARIA roles were not used

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted ARIA attributes

○`[role]`s have all required `[aria-*]` attributes

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○`[role]` values are valid

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○`[aria-*]` attributes have valid values

○`[aria-*]` attributes are valid and not misspelled

○Buttons have an accessible name

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

	URL	Displayed size	Actual size	Expected size
Akamai `footer#contentinfo > address#donors > a > img#logo-akamai`	www.kernel.org/theme/images/logos/akamai.png	135 x 55	135 x 55	203 x 83
The Linux Foundation `footer#contentinfo > address#donors > a > img#logo-lf`	www.kernel.org/theme/images/logos/thelinuxfoundation.png	137 x 45	137 x 45	206 x 68
Red Hat `footer#contentinfo > address#donors > a > img#logo-redhat`	www.kernel.org/theme/images/logos/redhat-community.png	150 x 36	150 x 36	225 x 54
Google `footer#contentinfo > address#donors > a > img#logo-google`	www.kernel.org/theme/images/logos/google.png	128 x 42	128 x 42	192 x 63
Constellix `footer#contentinfo > address#donors > a > img#logo-constellix`	www.kernel.org/theme/images/logos/constellix-green-logo.png	193 x 21	193 x 21	290 x 32
Fastly `footer#contentinfo > address#donors > a > img#logo-fastly`	www.kernel.org/theme/images/logos/fastly-logo.png	91 x 35	91 x 35	137 x 53
Download `tr > td#latest_button > a > img`	www.kernel.org/theme/images/icons/downloadarrow_small.png	48 x 48	48 x 48	72 x 72

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○robots.txt is valid

○Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

100

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

241 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

281 ms

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.002

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

241 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

281 ms

Detailed Report

Audit breakdown by category with detailed findings.

100

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
www.kernel.org/theme/fonts/oswald-regular-webfont.woff2	0.0 ms	20.2 KiB
www.kernel.org/theme/fonts/oxygen-regular-webfont.woff2	0.0 ms	19.6 KiB
www.kernel.org/theme/images/logos/serverscom.svg	0.0 ms	8.0 KiB
www.kernel.org/theme/images/logos/tux.png	0.0 ms	7.7 KiB
www.kernel.org/theme/css/normalize.css	0.0 ms	7.4 KiB
www.kernel.org/theme/css/main.css	0.0 ms	6.5 KiB
www.kernel.org/theme/images/logos/akamai.png	0.0 ms	4.7 KiB
www.kernel.org/theme/images/logos/redhat-community.png	0.0 ms	3.5 KiB
www.kernel.org/theme/images/logos/google.png	0.0 ms	3.0 KiB
www.kernel.org/theme/images/logos/thelinuxfoundation.png	0.0 ms	2.8 KiB
www.kernel.org/theme/images/logos/constellix-green-logo.png	0.0 ms	2.4 KiB
www.kernel.org/theme/images/logos/fastly-logo.png	0.0 ms	1.7 KiB
www.kernel.org/theme/images/icons/downloadarrow_small.png	0.0 ms	1.1 KiB

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

URL	Est Savings
www.kernel.org/theme/fonts/oswald-regular-webfont.woff2	145 ms
www.kernel.org/theme/fonts/oxygen-regular-webfont.woff2	145 ms

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
body#index > header#banner > div#tux-gear `body#index > header#banner > div#tux-gear`	www.kernel.org/theme/images/logos/tux.png	7.5 KiB	5.5 KiB

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size
www.kernel.org/theme/css/normalize.css	7.4 KiB
www.kernel.org/theme/css/main.css	6.5 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Estimated savings: 0.0 ms 5.5 KiB

URL	Transfer Size	Est Savings
www.kernel.org/theme/css/normalize.css	7.4 KiB	5.5 KiB

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 0.3 s

●Max Potential First Input Delay 20 ms

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 96 KiB

●Minimizes main-thread work 0.1 s

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 0 ms

●Server Backend Latencies 0 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 0 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○JavaScript execution time

○Avoid long main-thread tasks

○Avoid non-composited animations

Accessibility

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Failing Elements
About `nav > ul > li > a`
Contact us `nav > ul > li > a`
FAQ `nav > ul > li > a`
Releases `nav > ul > li > a`
Signatures `nav > ul > li > a`
Site news `nav > ul > li > a`
This site is operated by the Linux Kernel Organization, a 501(c)3 nonprofit cor… `body#index > footer#contentinfo > address#about`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Failing Elements
501(c)3 nonprofit corporation `body#index > footer#contentinfo > address#about > a`

These are opportunities to improve the legibility of your content.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Failing Elements
HTTP `tbody > tr > td > a`
https://www.kernel.org/pub/ `tbody > tr > td > a`
GIT `tbody > tr > td > a`
https://git.kernel.org/ `tbody > tr > td > a`
RSYNC `tbody > tr > td > a`
Git Trees `div.blogroll > ul > li > a`
Patchwork `div.blogroll > ul > li > a`
Wikis `div.blogroll > ul > li > a`
Bugzilla `div.blogroll > ul > li > a`
Mirrors `div.blogroll > ul > li > a`
Linux.com `div.blogroll > ul > li > a`
Site Atom feed `div.social > ul > li > a`
Releases Atom Feed `div.social > ul > li > a`
Kernel Planet `div.social > ul > li > a`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Failing Elements
html `html`

These items highlight common accessibility best practices.

Failing Elements
mainline: 7.0-rc7 2026-04-05 [tarball] [patch] [inc. patch] [view diff] [brows… `body#index > aside#featured > article > table#releases`

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●Image elements have `[alt]` attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

●Heading elements appear in a sequentially-descending order

●Identical links have the same purpose.

●Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA attributes are used as specified for the element's role

○Deprecated ARIA roles were not used

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted ARIA attributes

○`[role]`s have all required `[aria-*]` attributes

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○`[role]` values are valid

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○`[aria-*]` attributes have valid values

○`[aria-*]` attributes are valid and not misspelled

○Buttons have an accessible name

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

SEO

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○robots.txt is valid

○Document has a valid `rel=canonical`

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Lighthouse Scores

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Diagnostics

Accessibility

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Best practices

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User Experience

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Contrast

Best practices

Best Practices

SEO

Content Best Practices

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