Lighthouse Desktop

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

Request	Cache TTL	Transfer Size
cdn.factcheck.org/UploadedFiles/x-icon-logo-black.png	0.0 ms	100.4 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-viralspiral.png	0.0 ms	6.3 KiB
cdn.factcheck.org/UploadedFiles/misconceptions2.png	0.0 ms	6.0 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-instagram-1.png	0.0 ms	5.8 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-signup.png	0.0 ms	4.3 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-mailbag.png	0.0 ms	3.8 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-scicheck.png	0.0 ms	3.7 KiB
cdn.factcheck.org/UploadedFiles/factchecksidebar_icon-1.png	0.0 ms	3.3 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-ota.png	0.0 ms	3.0 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-donate.png	0.0 ms	1.4 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-rss.png	0.0 ms	1.3 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-email.png	0.0 ms	1.1 KiB
cdn.factcheck.org/UploadedFiles/fc-icon-facebook-mini.png	0.0 ms	709 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:0.114165] map[node:map[boundingRect:map[bottom:859 height:326 left:120 right:850 top:533 width:730] lhId:page-32-ARTICLE nodeLabel:We Won a Webby People’s Voice Award April 21, 2026 We’re honored to have won t… path:1,HTML,1,BODY,3,DIV,4,DIV,0,DIV,0,DIV,1,DIV,0,MAIN,1,ARTICLE selector:div.row > div#primary > main#main > article#post-281998 snippet:<article class="post-281998 post type-post status-publish format-standard has-post-thumbna…" id="post-281998"> type:node] score:0.096559 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:67 height:28 left:1158 right:1228 top:39 width:70] lhId:page-31-IMG nodeLabel:Help us hold politicians accountable. path:1,HTML,1,BODY,3,DIV,1,DIV,0,DIV,1,DIV,0,DIV,5,DIV,0,A,0,IMG selector:div.fc-social-media-header > div.fc-social-media-header-icon > a > img snippet:<img src="https://cdn.factcheck.org/UploadedFiles/fc-icon-donate.png" alt="Help us hold politicians accountable. "> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:896 height:122 left:1009 right:1237 top:775 width:228] lhId:page-24-DIV nodeLabel:SciCheck's COVID-19/Vaccination Project Preempting and exposing vaccination and… path:1,HTML,1,BODY,3,DIV,4,DIV,0,DIV,0,DIV,4,DIV,3,ASIDE,0,DIV,0,A,0,DIV,1,DIV,0,DIV selector:a > div.row > div.col-10 > div.fc-links-text snippet:<div class="fc-links-text"> type:node] score:0.009185 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:896 height:122 left:1009 right:1237 top:775 width:228] lhId:page-24-DIV nodeLabel:SciCheck's COVID-19/Vaccination Project Preempting and exposing vaccination and… path:1,HTML,1,BODY,3,DIV,4,DIV,0,DIV,0,DIV,4,DIV,3,ASIDE,0,DIV,0,A,0,DIV,1,DIV,0,DIV selector:a > div.row > div.col-10 > div.fc-links-text snippet:<div class="fc-links-text"> type:node] score:0.005254 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1527 height:202 left:152 right:354 top:1325 width:202] lhId:page-7-IMG nodeLabel:An Attack Over ICE in the Massachusetts Democratic Senate Race path:1,HTML,1,BODY,3,DIV,4,DIV,0,DIV,0,DIV,1,DIV,0,MAIN,5,ARTICLE,1,DIV,0,DIV,0,A,0,IMG selector:div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail snippet:<img width="200" height="200" src="https://cdn.factcheck.org/UploadedFiles/Seth-Moulton-Ad-720-x-307-200x200.…" class="attachment-thumbnail size-thumbnail wp-post-image" alt="An Attack Over ICE in the Massachusetts Democratic Senate Race" decoding="async"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1121 height:78 left:1009 right:1237 top:1043 width:228] lhId:page-25-DIV nodeLabel:SciCheck Fact-checking science-based claims. path:1,HTML,1,BODY,3,DIV,4,DIV,0,DIV,0,DIV,4,DIV,3,ASIDE,0,DIV,2,A,0,DIV,1,DIV,0,DIV selector:a > div.row > div.col-10 > div.fc-links-text snippet:<div class="fc-links-text"> type:node] score:0.001663 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:67 height:28 left:979 right:1007 top:39 width:28] lhId:page-41-IMG nodeLabel:Become a Facebook fan path:1,HTML,1,BODY,3,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.fc-social-media-header > div.fc-social-media-header-icon > a > img snippet:<img src="https://cdn.factcheck.org/UploadedFiles/fc-icon-facebook-mini.png" alt="Become a Facebook fan"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:140 height:56 left:313 right:480 top:84 width:167] lhId:page-15-LI nodeLabel:ASK A QUESTION path:1,HTML,1,BODY,3,DIV,2,DIV,0,NAV,0,DIV,3,DIV,0,UL,2,LI selector:div.container > div#navbarNavDropdown > ul#main-menu > li#menu-item-121564 snippet:<li itemscope="itemscope" itemtype="https://www.schema.org/SiteNavigationElement" id="menu-item-121564" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-chil…"> type:node] score:0.001402 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/spacegrotesk/v22/V8mQoQDjQSkFtoMM3T6r8E7mF71Q-gOoraIAEj7oUXskPMBBSSJLm2E.woff2]]] type:subitems]]]

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.

	URL	Resource Size	Est Savings
div.carousel-inner > div.carousel-item > a > img.d-block `div.carousel-inner > div.carousel-item > a > img.d-block`	cdn.factcheck.org/UploadedFiles/Glyphosate-1-720-x-307.png	315.6 KiB	279.6 KiB
Follow us on Twitter `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/x-icon-logo-black.png	99.9 KiB	99.9 KiB
Trump Fumbles the Facts with Farmers `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/WH-Tractor-720-x-307-200x200.png	84.3 KiB	77.8 KiB
The U.S. Treasury Didn’t Declare the Country ‘Insolvent’ `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Money-Capitol-720-x-307-200x200.png	84.2 KiB	77.7 KiB
Politicians Say Glyphosate Weedkiller Causes Cancer But Evidence Not Clear-Cut `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Glyphosate-1-720-x-307-200x200.png	73.7 KiB	67.2 KiB
Trump Links Biden’s Ukraine Aid to Pentagon’s Iran War Funding Request `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/TH-720-x-307-200x200.png	72.3 KiB	65.8 KiB
Elon Musk Amplifies Baseless Claim About COVID-19 Vaccine `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Musk-X-720-x-307-200x200.png	68.2 KiB	61.7 KiB
An Attack Over ICE in the Massachusetts Democratic Senate Race `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Seth-Moulton-Ad-720-x-307-200x200.png	57.9 KiB	51.4 KiB
FactChecking Trump’s Prime-Time Address on Iran `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Trump-Iran-Speech-720-x-307-200x200.png	57.4 KiB	50.9 KiB
Happy International Fact-Checking Day `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Screenshot-2026-04-02-at-1.03.04-PM-200x200.png	32.9 KiB	26.4 KiB
We Could Win a Webby with Your Vote `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Webby-720-x-307-200x200.png	31.5 KiB	25.0 KiB
We Won a Webby People’s Voice Award `div.row > div.col-12 > a.img-fluid > img.attachment-thumbnail`	cdn.factcheck.org/UploadedFiles/Webby-Winner-720-x-307-200x200.png	23.5 KiB	17.0 KiB
Follow on Insta `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/fc-icon-instagram-1.png	5.4 KiB	5.3 KiB
Viral Spiral `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/fc-icon-viralspiral.png	5.9 KiB	4.6 KiB
Proyecto de Vacunación/COVID-19 `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/misconceptions2.png	5.6 KiB	4.3 KiB

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: div.carousel-inner > div.carousel-item > a > img.d-block

path: 1,HTML,1,BODY,3,DIV,4,DIV,0,DIV,0,DIV,1,DIV,0,MAIN,0,DIV,1,DIV,0,DIV,0,A,0,IMG

selector: div.carousel-inner > div.carousel-item > a > img.d-block

snippet: <img class="d-block w-100" src="https://cdn.factcheck.org/UploadedFiles/Glyphosate-1-720-x-307.png" 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

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.

URL	Transfer Size	Duration
/css2?family=Merriweather:wght@300;400;700&family=Space+G...	1.2 KiB	266 ms
www.factcheck.org/wp-content/themes/understrap/js/popper.min.js?ver=6.8.3	6.8 KiB
www.factcheck.org/wp-includes/css/dashicons.min.css?ver=6.8.3	35.0 KiB	80 ms
/wp-content/plugins/duracelltomi-google-tag-manager/dist/...	725 B
/wp-content/themes/factcheckstrap/css/child-theme.min.css...	9.0 KiB
www.factcheck.org/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3	15.1 KiB

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.

URL	Est Savings
/wp-content/themes/factcheckstrap/fonts/fontawesome-webfo...	15 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: 211 ms

URL	Time Spent
factcheck.org/	211 ms
www.factcheck.org/	0.0 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.

Element	Layout shift score
We Won a Webby People’s Voice Award April 21, 2026 We’re honored to have won t… `div.row > div#primary > main#main > article#post-281998`	0.097
SciCheck's COVID-19/Vaccination Project Preempting and exposing vaccination and… `a > div.row > div.col-10 > div.fc-links-text`	0.009
SciCheck's COVID-19/Vaccination Project Preempting and exposing vaccination and… `a > div.row > div.col-10 > div.fc-links-text`	0.005
SciCheck Fact-checking science-based claims. `a > div.row > div.col-10 > div.fc-links-text`	0.002
ASK A QUESTION `div.container > div#navbarNavDropdown > ul#main-menu > li#menu-item-121564`	0.001
`div.d-none > div.fc-social-media-header > div.fc-social-media-header-icon > a`	0.000

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

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: 80 ms 49.9 KiB

URL	Transfer Size	Est Savings
www.factcheck.org/wp-includes/css/dashicons.min.css?ver=6.8.3	34.9 KiB	34.9 KiB
www.factcheck.org/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3	15.0 KiB	14.9 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: 80 ms 214.8 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-1YN7LB2WN8&cx=c&gtm=4e64k0	170.0 KiB	68.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-PFGD5J2	155.5 KiB	65.8 KiB
www.googletagmanager.com/gtag/destination?id=AW-1007263401&cx=c&gtm=4e64k0	137.3 KiB	59.8 KiB
code.jquery.com/jquery-latest.min.js?ver=6.8.3	32.5 KiB	20.6 KiB

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: 0.0 ms 7.2 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/factcheckstrap/js/child-theme.min.js?v...	20.0 KiB	7.2 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
cdn.factcheck.org/UploadedFiles/VoterRegistration1.png	373.2 KiB
cdn.factcheck.org/UploadedFiles/Glyphosate-1-720-x-307.png	316.3 KiB
cdn.factcheck.org/UploadedFiles/SAVE-720-x-307.png	289.2 KiB
cdn.factcheck.org/UploadedFiles/Trump-Iran-Speech-720-x-307.png	257.2 KiB
cdn.factcheck.org/UploadedFiles/Trump-Iran-720-x-307.png	217.3 KiB
www.googletagmanager.com/gtag/js?id=G-1YN7LB2WN8&cx=c&gtm=4e64k0	170.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-PFGD5J2	155.9 KiB
www.googletagmanager.com/gtag/destination?id=AW-1007263401&cx=c&gtm=4e64k0	137.3 KiB
cdn.factcheck.org/UploadedFiles/x-icon-logo-black.png	100.4 KiB
/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpP...	95.4 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
Follow us on Twitter `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/x-icon-logo-black.png
div.carousel-inner > div.carousel-item > a > img.d-block `div.carousel-inner > div.carousel-item > a > img.d-block`	cdn.factcheck.org/UploadedFiles/Glyphosate-1-720-x-307.png
Help us hold politicians accountable. `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/fc-icon-donate.png
Become a Facebook fan `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/fc-icon-facebook-mini.png
Get the RSS feed `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/fc-icon-rss.png
Follow on Insta `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/fc-icon-instagram-1.png
Sign up for the email newsletter `div.fc-social-media-header > div.fc-social-media-header-icon > a > img`	cdn.factcheck.org/UploadedFiles/fc-icon-email.png
SciCheck's COVID-19/Vaccination Project `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/misconceptions2.png
Proyecto de Vacunación/COVID-19 `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/misconceptions2.png
SciCheck `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/fc-icon-scicheck.png
Viral Spiral `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/fc-icon-viralspiral.png
Newsletter `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/fc-icon-signup.png
Mailbag `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/fc-icon-mailbag.png
On the Air `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/fc-icon-ota.png
NewsFeed Defenders `a > div.row > div.col-2 > img.img-fluid`	cdn.factcheck.org/UploadedFiles/factchecksidebar_icon-1.png

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

●Max Potential First Input Delay 90 ms

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 10 user timings

●JavaScript execution time 0.2 s

●Minimizes main-thread work 0.5 s

●Avoid long main-thread tasks 2 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 60 ms

●Server Backend Latencies 380 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 10 ms

○INP breakdown

○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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
ARTICLES `div#navbarNavDropdown > ul#main-menu > li#menu-item-75124 > a#menu-item-dropdown-75124`
ASK A QUESTION `div#navbarNavDropdown > ul#main-menu > li#menu-item-121564 > a#menu-item-dropdown-121564`
DONATE `div#navbarNavDropdown > ul#main-menu > li#menu-item-135871 > a.nav-link`
TOPICS `div#navbarNavDropdown > ul#main-menu > li#menu-item-75144 > a#menu-item-dropdown-75144`
ABOUT US `div#navbarNavDropdown > ul#main-menu > li#menu-item-75727 > a#menu-item-dropdown-75727`
SEARCH `div#navbarNavDropdown > ul#main-menu > li#menu-item-75130 > a.nav-link`
MORE `div#navbarNavDropdown > ul#main-menu > li#menu-item-75125 > a#menu-item-dropdown-75125`

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Ask us. `aside#factcheck_ask_widget-2 > div.fc-ask-widget > div > a`

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
SciCheck's COVID-19/Vaccination Project `div.row > div.col-10 > div.fc-links-text > h5`

These are opportunities to improve keyboard navigation in your application.

○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

●Image elements have `[alt]` attributes

●`[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

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

●Elements use only permitted ARIA 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

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

●Touch targets have sufficient size and spacing.

●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

○Elements with `role="dialog"` or `role="alertdialog"` 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

○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">`

○`<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.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
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●Uses HTTPS

●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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`