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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

39

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
www.ukri.org/wp-content/themes/ukri/assets/fonts/Moderat-Extended-Bold.otf0.0 ms105.2 KiB
www.ukri.org/wp-content/themes/ukri/assets/fonts/Moderat-Bold.otf0.0 ms102.9 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/banner-paint.jpg0.0 ms89.0 KiB
/wp-content/themes/ukri/build/main-8338dd44fc341a5dda5e84...0.0 ms41.7 KiB
/wp-content/uploads/2026/04/UKRI-130426-FastFoodLeftovers...0.0 ms26.4 KiB
www.ukri.org/wp-content/themes/ukri/build/img/green-swirl-top3.png0.0 ms24.5 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-ahrc-square-logo.png0.0 ms21.5 KiB
/wp-content/themes/ukri/build/main-0a09750327a2955360b091...0.0 ms20.5 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-bbsrc-standard-logo.png0.0 ms19.7 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-bbsrc-square-logo.png0.0 ms19.6 KiB
/wp-content/uploads/2026/04/STFC-220426-News-LightWaveGro...0.0 ms19.5 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-epsrc-standard-logo.png0.0 ms16.8 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-epsrc-square-logo.png0.0 ms16.6 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-stfc-standard-logo.png0.0 ms16.0 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-stfc-square-logo.png0.0 ms15.6 KiB
www.ukri.org/wp-includes/css/dist/block-library/style.min.css?ver=6.8.30.0 ms15.4 KiB
/wp-content/uploads/2026/04/MRC-200426-GettyImages-124245...0.0 ms15.4 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-esrc-standard-logo.png0.0 ms15.2 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-ahrc-standard-logo.png0.0 ms14.8 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-esrc-square-logo.png0.0 ms14.5 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-nerc-standard-logo.png0.0 ms14.3 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-nerc-square-logo.png0.0 ms14.0 KiB
/wp-content/uploads/2026/03/MRC-310326-Blog-OnlineMeeting...0.0 ms13.3 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js?ver=6.8.3604800.0 s123.3 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-mrc-standard-logo.png0.0 ms12.0 KiB
/wp-content/uploads/2026/04/UKRI-100426-BusinessmanWaitin...0.0 ms11.9 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-mrc-square-logo.png0.0 ms11.5 KiB
/wp-content/uploads/2026/04/MRC-200426-News-ManHoldingGut...0.0 ms10.8 KiB
www.ukri.org/wp-content/uploads/2026/03/GettyImages-1306714609-1-1-1-300x200.jpg0.0 ms10.7 KiB
www.ukri.org/wp-content/uploads/2026/03/MRC-310326-Feature-image-300x200.jpg0.0 ms10.7 KiB
/wp-content/themes/ukri/assets/img/ukri-research-england-...0.0 ms10.5 KiB
/wp-content/themes/ukri/assets/img/ukri-research-england-...0.0 ms10.1 KiB
/wp-content/uploads/2026/03/ESRC-240326-BabyGirlSleepingB...0.0 ms10.0 KiB
www.ukri.org/wp-content/uploads/2026/04/bat-coronaviruses-image-300x200.jpg0.0 ms9.9 KiB
/wp-content/themes/ukri/assets/img/ukri-innovate-uk-stand...0.0 ms8.5 KiB
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-innovate-uk-square-logo.png0.0 ms7.8 KiB
www.ukri.org/wp-content/themes/ukri/build/img/all-councils-horizontal-stack.png0.0 ms4.4 KiB
/wp-content/plugins/tablepress-premium/modules/css/build/...0.0 ms2.8 KiB
www.ukri.org/wp-content/tablepress-combined.min.css?ver=110.0 ms2.4 KiB
www.ukri.org/wp-content/themes/ukri/build/img/right-arrow-blue.png0.0 ms1.9 KiB
www.ukri.org/wp-content/themes/ukri/build/img/right-arrow.png0.0 ms1.8 KiB
/wp-content/themes/ukri/build/print-e4ed8a5e6e70ce8df42e0...0.0 ms1.7 KiB
www.ukri.org/wp-content/themes/ukri/build/img/social-media-icon-instagram.svg0.0 ms1.4 KiB
www.ukri.org/wp-content/themes/ukri/build/img/social-media-icon-youtube.svg0.0 ms1.0 KiB
www.ukri.org/wp-content/themes/ukri/build/img/social-media-icon-medium.svg0.0 ms920 B
www.ukri.org/wp-content/themes/ukri/build/img/social-media-icon-linkedin.svg0.0 ms858 B
www.ukri.org/wp-content/themes/ukri/build/img/social-media-icon-facebook.svg0.0 ms777 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.186999] map[node:map[boundingRect:map[bottom:1111 height:428 left:0 right:412 top:683 width:412] lhId:page-14-DIV nodeLabel:Featured How quantum will change your life Safer sleep for babies Up… path:1,HTML,1,BODY,3,MAIN,0,DIV,0,DIV,3,DIV selector:main#main-content > div.homepage-body-area > div.govuk-width-container > div.govuk-grid-row snippet:<div class="govuk-grid-row"> type:node] score:0.163436 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:411 height:83 left:22 right:122 top:328 width:100] lhId:page-1-IMG nodeLabel:Arts and Humanities Research Council path:1,HTML,1,BODY,3,MAIN,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,A,1,IMG selector:div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-ahrc > img.homepage-council-square-logo snippet:<img src="/wp-content/themes/ukri/assets/img/ukri-ahrc-square-logo.png" alt="Arts and Humanities Research Council" class="homepage-council-square-logo"> type:node]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:1111 height:428 left:0 right:412 top:683 width:412] lhId:page-14-DIV nodeLabel:Featured How quantum will change your life Safer sleep for babies Up… path:1,HTML,1,BODY,3,MAIN,0,DIV,0,DIV,3,DIV selector:main#main-content > div.homepage-body-area > div.govuk-width-container > div.govuk-grid-row snippet:<div class="govuk-grid-row"> type:node] score:0.023563 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:411 height:83 left:22 right:122 top:328 width:100] lhId:page-1-IMG nodeLabel:Arts and Humanities Research Council path:1,HTML,1,BODY,3,MAIN,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,A,1,IMG selector:div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-ahrc > img.homepage-council-square-logo snippet:<img src="/wp-content/themes/ukri/assets/img/ukri-ahrc-square-logo.png" alt="Arts and Humanities Research Council" class="homepage-council-square-logo"> type:node]]] type:subitems]]]

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
www.ukri.org/wp-content/themes/ukri/assets/fonts/Moderat-Extended-Bold.otf310 ms
www.ukri.org/wp-content/themes/ukri/assets/fonts/Moderat-Bold.otf310 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner
www.ukri.org/wp-content/themes/ukri/assets/img/banner-paint.jpg88.5 KiB74.1 KiB
Arts and Humanities Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-ahrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-ahrc-square-logo.png21.0 KiB18.4 KiB
Biotechnology and Biological Sciences Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-bbsrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-bbsrc-square-logo.png19.2 KiB16.8 KiB
div.govuk-grid-column-full > div#post-190259 > a.ukri-linked-panel__link > img.attachment-3x2-large div.govuk-grid-column-full > div#post-190259 > a.ukri-linked-panel__link > img.attachment-3x2-large
/wp-content/uploads/2026/04/UKRI-130426-FastFoodLeftovers...26.0 KiB16.2 KiB
Engineering and Physical Sciences Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-epsrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-epsrc-square-logo.png16.2 KiB14.1 KiB
Science and Technology Facilities Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-stfc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-stfc-square-logo.png15.1 KiB13.2 KiB
Subscribe to UKRI emails Keep up to date with funding, news and events, and a … div.govuk-width-container > div.govuk-grid-row > div.govuk-grid-column-one-third-from-desktop > div.ukri-email-signup__widget
www.ukri.org/wp-content/themes/ukri/build/img/green-swirl-top3.png24.1 KiB12.5 KiB
Economic and Social Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-esrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-esrc-square-logo.png14.1 KiB12.3 KiB
Natural Environment Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-nerc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-nerc-square-logo.png13.6 KiB11.9 KiB
Medical Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-mrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-mrc-square-logo.png11.1 KiB9.7 KiB
div.govuk-grid-column-one-half > div#post-190638 > a.ukri-linked-panel__link > img.attachment-3x2-small div.govuk-grid-column-one-half > div#post-190638 > a.ukri-linked-panel__link > img.attachment-3x2-small
/wp-content/uploads/2026/04/STFC-220426-News-LightWaveGro...19.0 KiB9.3 KiB
Research England div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-re > img.homepage-council-square-logo
/wp-content/themes/ukri/assets/img/ukri-research-england-...9.7 KiB8.4 KiB
Innovate UK div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-iuk > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-innovate-uk-square-logo.png7.3 KiB6.4 KiB
div.govuk-grid-column-one-half > div#post-190487 > a.ukri-linked-panel__link > img.attachment-3x2-small div.govuk-grid-column-one-half > div#post-190487 > a.ukri-linked-panel__link > img.attachment-3x2-small
/wp-content/uploads/2026/04/MRC-200426-GettyImages-124245...15.0 KiB5.2 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:1607.295 label:Time to first byte subpart:timeToFirstByte] map[duration:16.129 label:Resource load delay subpart:resourceLoadDelay] map[duration:572.357 label:Resource load duration subpart:resourceLoadDuration] map[duration:615.341 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner
path: 1,HTML,1,BODY,2,DIV,0,HEADER,1,DIV,2,DIV,0,IMG
selector: header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner
snippet: <img src="/wp-content/themes/ukri/assets/img/banner-paint.jpg" class="homepage-banner" alt="">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner
path: 1,HTML,1,BODY,2,DIV,0,HEADER,1,DIV,2,DIV,0,IMG
selector: header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner
snippet: <img src="/wp-content/themes/ukri/assets/img/banner-paint.jpg" class="homepage-banner" alt="">

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
/wp-content/themes/ukri/build/main-8338dd44fc341a5dda5e84...41.7 KiB337 ms
www.ukri.org/wp-includes/css/dist/block-library/style.min.css?ver=6.8.315.4 KiB
www.ukri.org/wp-content/tablepress-combined.min.css?ver=112.4 KiB
/wp-content/plugins/tablepress-premium/modules/css/build/...2.8 KiB337 ms
fonts.googleapis.com/css?family=Roboto:400,500,700&display=swap2.1 KiB826 ms

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.3 s
URLTime Spent
ukri.org/1.3 s
www.ukri.org/0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 539 ms
URLTime Spent
www.ukri.org/639 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Featured How quantum will change your life Safer sleep for babies Up… main#main-content > div.homepage-body-area > div.govuk-width-container > div.govuk-grid-row
0.163
Featured How quantum will change your life Safer sleep for babies Up… main#main-content > div.homepage-body-area > div.govuk-width-container > div.govuk-grid-row
0.024

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 340 ms 8.9 KiB
URLTransfer SizeEst Savings
/wp-content/themes/ukri/build/main-0a09750327a2955360b091...20.1 KiB8.9 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 340 ms 53.8 KiB
URLTransfer SizeEst Savings
/wp-content/themes/ukri/build/main-8338dd44fc341a5dda5e84...41.3 KiB38.8 KiB
www.ukri.org/wp-includes/css/dist/block-library/style.min.css?ver=6.8.315.0 KiB15.0 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 670 ms 173.3 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-W522DW8144.8 KiB62.4 KiB
www.googletagmanager.com/gtag/js?id=All%20UKRIG-HPSM59M7J4&cx=c&gtm=4e64k0h184.6 KiB56.0 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js?ver=6.8.3122.9 KiB54.8 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner header.govuk-header > div.govuk-header__container > div.homepage-banner-area > img.homepage-banner
www.ukri.org/wp-content/themes/ukri/assets/img/banner-paint.jpg
Arts and Humanities Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-ahrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-ahrc-square-logo.png
Biotechnology and Biological Sciences Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-bbsrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-bbsrc-square-logo.png
Economic and Social Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-esrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-esrc-square-logo.png
Engineering and Physical Sciences Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-epsrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-epsrc-square-logo.png
Innovate UK div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-iuk > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-innovate-uk-square-logo.png
Medical Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-mrc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-mrc-square-logo.png
Natural Environment Research Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-nerc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-nerc-square-logo.png
Research England div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-re > img.homepage-council-square-logo
/wp-content/themes/ukri/assets/img/ukri-research-england-...
Science and Technology Facilities Council div.ukri-one-half-from-big-screen > div.homepage-council-logos > a.homepage-council-stfc > img.homepage-council-square-logo
www.ukri.org/wp-content/themes/ukri/assets/img/ukri-stfc-square-logo.png

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

●Optimize DOM size
●Forced reflow
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Avoids enormous network payloads Total size was 1,227 KiB
●JavaScript execution time 0.9 s
●Minimizes main-thread work 1.9 s
●Avoid long main-thread tasks 9 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 190 ms
●Server Backend Latencies 250 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
○INP breakdown
○User Timing marks and measures
○Avoid non-composited animations
100

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.

○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-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●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
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○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
○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
○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
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<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.
○Identical links have the same purpose.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
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
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
100

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.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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