Lighthouse Mobile

· 0 checks — Mobile 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
mfstatic.com/js/mediaflowplayer.min.js	0.0 ms	232.1 KiB
analytics.silktide.com/74b131141f81660adb30681e6579d5b4.js	0.0 ms	16.4 KiB
mfstatic.com/css/mediaflowplayer.min.css	0.0 ms	10.7 KiB
cdn.matomo.cloud/su.matomo.cloud/container_Pt55LtXh.js	691200.0 s	81.8 KiB
/plugins/HeatmapSessionRecording/configs.php?idsite=10&tr...	0.0 ms	270 B
/plugins/HeatmapSessionRecording/configs.php?idsite=1&tra...	0.0 ms	268 B

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.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:78.549 source:map[column:41033 line:2 type:source-location url:https://www.su.se/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91323565c321a3e9eae94fac0e4faeb5977ea/js/jquery.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:70.421 source:map[column:71305 line:2 type:source-location url:https://www.su.se/webapp-resource/2.5a231a8f188bd840a134521/360.23a0fc5419d726c9ba87f2/1776147172726/webapp-assets.js urlProvider:network]] map[reflowTime:78.549 source:map[column:47230 line:2 type:source-location url:https://www.su.se/webapp-resource/2.5a231a8f188bd840a134521/360.23a0fc5419d726c9ba87f2/1776147172726/webapp-assets.js urlProvider:network]]]

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
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.5f8fe52119d9a4bc20bda8/1776865364340/genre dig...	3.5 MiB	3.5 MiB
div > div.su-hero-banner > div.su-hero-banner--image > img `div > div.su-hero-banner > div.su-hero-banner--image > img`	www.su.se/images/18.d01044619d9a6c5b29c08/1776779254653/DSC_3667.jpg	1.7 MiB	1.7 MiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	www.su.se/images/18.5f8fe52119d9a4bc20be19/1776867556754/genre%20beredskap.jpg	1.3 MiB	1.2 MiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.5f8fe52119d9a4bc20bea1/1776874464408/MixCollag...	1.2 MiB	1.2 MiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.d01044619d9a6c5b29768/1776692469700/Studentrek...	1.1 MiB	1.1 MiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	www.su.se/images/18.d01044619d9a6c5b29b85/1776771001285/(2)%204Y7A3719.JPG	997.2 KiB	991.9 KiB
Konstvetarstudenter visar tavlan "Överfallet" i paradvåningen på Spökslottet. `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	www.su.se/images/18.d01044619d9a6c5b297af/1776693955539/%C3%96verfallet1.jpg	938.5 KiB	922.5 KiB
Brunbjörn `article.su-teaser-list--article > div.su-teaser-list--article-content > div.su-teaser-list--article-content-image-container > img`	/images/18.2fd6983b19d8b889c442dc/1776250820618/mp1424393...	881.5 KiB	867.9 KiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	www.su.se/images/18.52d6207619c988d3d5c3206/1773651165101/(2)%20RUT.jpg	639.0 KiB	631.0 KiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.45a81cd519d9a5b7372a8a/1776753786959/mp6586694...	525.3 KiB	511.1 KiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.4a2ab21219d9a7a94d4dbc/1776842986125/aryan-dhi...	397.3 KiB	381.3 KiB
Kollage med hedersdokterna 2026 `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.4a2ab21219d9a7a94d4e36/1776844128311/kollage_h...	388.4 KiB	376.1 KiB
Om Vetenskap - koldioxidinfångning `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.4a2ab21219d9a7a94d4b47/1776755415894/Koldioxid...	371.3 KiB	359.3 KiB
Studenter på campus. `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.d01044619d9a6c5b2925a/1776430679442/Studentrek...	371.0 KiB	356.7 KiB
Personerna i delegationen från SU vid ett runt bord `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.4a2ab21219d9a7a94d4bd2/1776762760062/SU-forska...	262.7 KiB	248.1 KiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.5f8fe52119d9a4bc20ba72/1776784833947/657725801...	240.3 KiB	218.9 KiB
article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.5f8fe52119d9a4bc20bc22/1776851214634/helena_en...	202.6 KiB	189.2 KiB
Studenter som pratar med varandra. `article.su-news-list--article > div.su-news-list--article-content > div.su-news-list--article-content-image-container > img`	/images/18.6856063019d24ef3ecb11de/1774959008812/Studentr...	131.1 KiB	116.8 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-1-IMG

nodeLabel: div > div.su-hero-banner > div.su-hero-banner--image > img

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

selector: div > div.su-hero-banner > div.su-hero-banner--image > img

snippet: <img src="https://www.su.se/images/18.d01044619d9a6c5b29c08/1776779254653/DSC_3667.j…" alt="">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.su.se/	http/1.1
/2.5a231a8f188bd840a134521/1776410151195/sitevision-respo...	http/1.1
www.su.se/2.5a231a8f188bd840a134521/auto/1776887056608/SiteVision.css	http/1.1
www.su.se/2.5a231a8f188bd840a134521/0/8369/print/SiteVision.css	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
/2.5a231a8f188bd840a134521/91.15de9d5119913bb5c0121b/1776...	http/1.1
www.su.se/2.5a231a8f188bd840a134521/1776410574412/sitevision-spacing.css	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.79f8abbf19...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.1a81f8119d...	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
www.su.se/download/18.2d628a5318a2603b04316cc1/1776849014790/main.min.css	http/1.1
/images/18.5a231a8f188bd840a1328111/1692259247399/su_logo...	http/1.1
/images/18.7e64877b1926afdc099b19f/1729174936147/su_logo_...	http/1.1
/images/18.16e68fb219937120b11cba5/1759220649190/su_logo_...	http/1.1
/images/18.6f0acc5f19a7bc9dc1f5c28c/1764666614536/magnify...	http/1.1
www.su.se/images/18.d01044619d9a6c5b29c08/1776779254653/DSC_3667.jpg	http/1.1
/images/18.1f09f4df19a7bbe0dfd4cb71/1764152902625/2022090...	http/1.1
www.su.se/download/18.2c91e408196f633cb5f6362/1773219662725/su-click-banner.js	http/1.1
www.su.se/download/18.1c7635ca19b2be312be5aa/1766047954093/su-cookie-banner.js	http/1.1
www.su.se/download/18.4347052c19c47d1ff8034a/1772023148506/su-caption-resizer.js	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.5b01cb3819...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.79f8abbf19...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.7e68021a19...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.1a81f8119d...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.3c7ac10919...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.14fa2df719...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.1c7635ca19...	http/1.1
/webapp-resource/2.5a231a8f188bd840a134521/360.23a0fc5419...	http/1.1
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	http/1.1
/images/18.69ccd2d2196c42b6a82400/1747295190641/Emblem-fo...	http/1.1
/download/18.2d628a5318a2603b0431e6f7/1693481959550/TheSa...	http/1.1
www.su.se/download/18.5ada87bc18adbd044d7c2cf/1696404433865/fa-regular-400.woff2	http/1.1
www.su.se/download/18.5ada87bc18adbd044d7c2d0/1696404457297/fa-solid-900.woff2	http/1.1
/download/18.5e3c3725188bd8dbcd4d7ffc/1692358764335/Caeci...	http/1.1
/download/18.2d628a5318a2603b0431e6f8/1693482011670/TheSa...	http/1.1
/appresource/2.5a231a8f188bd840a134521/12.16e68fb21993712...	http/1.1
/appresource/2.5a231a8f188bd840a134521/12.16e68fb21993712...	http/1.1
/appresource/2.5a231a8f188bd840a134521/12.6f2669b119c14e6...	http/1.1
/images/18.2fd6983b19d8b889c442dc/1776250820618/mp1424393...	http/1.1
/images/18.6856063019d24ef3ecb12c0/1774968734692/(2) Atmo...	http/1.1
/images/18.d01044619d9a6c5b2960c/1776673859039/(2) _DSC70...	http/1.1
www.su.se/images/18.d01044619d9a6c5b297af/1776693955539/%C3%96verfallet1.jpg	http/1.1
/images/18.d01044619d9a6c5b29768/1776692469700/Studentrek...	http/1.1
www.su.se/images/18.52d6207619c988d3d5c3206/1773651165101/(2)%20RUT.jpg	http/1.1
/images/18.d01044619d9a6c5b2925a/1776430679442/Studentrek...	http/1.1
/images/18.6856063019d24ef3ecb11de/1774959008812/Studentr...	http/1.1
/images/18.5f8fe52119d9a4bc20bea1/1776874464408/MixCollag...	http/1.1
www.su.se/images/18.5f8fe52119d9a4bc20be19/1776867556754/genre%20beredskap.jpg	http/1.1
/images/18.5f8fe52119d9a4bc20bda8/1776865364340/genre dig...	http/1.1
/images/18.5f8fe52119d9a4bc20bc22/1776851214634/helena_en...	http/1.1
/images/18.4a2ab21219d9a7a94d4e36/1776844128311/kollage_h...	http/1.1
/images/18.4a2ab21219d9a7a94d4dbc/1776842986125/aryan-dhi...	http/1.1
/images/18.5f8fe52119d9a4bc20ba72/1776784833947/657725801...	http/1.1
/images/18.4a2ab21219d9a7a94d4bd2/1776762760062/SU-forska...	http/1.1
www.su.se/images/18.d01044619d9a6c5b29b85/1776771001285/(2)%204Y7A3719.JPG	http/1.1
/images/18.4a2ab21219d9a7a94d4b47/1776755415894/Koldioxid...	http/1.1
/images/18.45a81cd519d9a5b7372a8a/1776753786959/mp6586694...	http/1.1
/images/200.1f09f4df19a7bbe0dfd4ca4d/1764151512646/x800p/...	http/1.1
www.su.se/images/200.1f09f4df19a7bbe0dfd4ca59/1764151895284/(2)%20DSC_6196.jpg	http/1.1
www.su.se/images/18.2a59d8a1196f66569aa1ec6/1749456267512/favicon.ico	http/1.1

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.

URL	Transfer Size	Duration
www.su.se/download/18.2d628a5318a2603b04316cc1/1776849014790/main.min.css	25.6 KiB	1.6 s

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
www.su.se/download/18.2d628a5318a2603b04316cc1/1776849014790/main.min.css	10 ms
www.su.se/download/18.2d628a5318a2603b04316cc1/1776849014790/main.min.css	5.0 ms

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

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

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: 819 ms

URL	Time Spent
su.se/	819 ms
www.su.se/	0.0 ms

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.

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: 370 ms 74.4 KiB

URL	Transfer Size	Est Savings
/2.5a231a8f188bd840a134521/91.15de9d5119913bb5c0121b/1776...	32.5 KiB	32.2 KiB
www.su.se/2.5a231a8f188bd840a134521/auto/1776887056608/SiteVision.css	22.5 KiB	22.3 KiB
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	22.8 KiB	19.9 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: 1.2 s 577.5 KiB

URL	Transfer Size	Est Savings
mfstatic.com/js/mediaflowplayer.min.js	231.8 KiB	195.1 KiB
mfstatic.com/js/mediaflowplayer.min.js	231.8 KiB	166.2 KiB
mfstatic.com/js/mediaflowplayer.min.js	231.8 KiB	166.0 KiB
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	38.3 KiB	26.8 KiB
cdn.matomo.cloud/su.matomo.cloud/container_Pt55LtXh.js	81.3 KiB	23.4 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
mfstatic.com/js/mediaflowplayer.min.js	2.6 s	1.6 s	572 ms
Unattributable	1.3 s	28 ms	0.0 ms
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	1.1 s	509 ms	5.2 ms
www.su.se/	917 ms	121 ms	38 ms
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	448 ms	273 ms	30 ms
cdn.matomo.cloud/su.matomo.cloud/container_Pt55LtXh.js	382 ms	267 ms	81 ms
/webapp-resource/2.5a231a8f188bd840a134521/360.23a0fc5419...	250 ms	64 ms	12 ms
analytics.silktide.com/74b131141f81660adb30681e6579d5b4.js	190 ms	73 ms	11 ms
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	131 ms	96 ms	24 ms
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	128 ms	101 ms	26 ms
/sitevision/system-resource/7a381d6fc52fd8251185cacec4a91...	91 ms	76 ms	14 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	3.2 s
Style & Layout	1.6 s
Other	1.5 s
Script Parsing & Compilation	866 ms
Parse HTML & CSS	340 ms
Rendering	101 ms
Garbage Collection	60 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.	Not actionable

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
/images/18.1f09f4df19a7bbe0dfd4cb71/1764152902625/2022090...	4.3 MiB
/images/18.5f8fe52119d9a4bc20bda8/1776865364340/genre dig...	3.5 MiB
www.su.se/images/18.d01044619d9a6c5b29c08/1776779254653/DSC_3667.jpg	1.7 MiB
www.su.se/images/18.5f8fe52119d9a4bc20be19/1776867556754/genre%20beredskap.jpg	1.3 MiB
/images/18.5f8fe52119d9a4bc20bea1/1776874464408/MixCollag...	1.2 MiB
/images/18.d01044619d9a6c5b29768/1776692469700/Studentrek...	1.1 MiB
www.su.se/images/18.d01044619d9a6c5b29b85/1776771001285/(2)%204Y7A3719.JPG	997.6 KiB
www.su.se/images/18.d01044619d9a6c5b297af/1776693955539/%C3%96verfallet1.jpg	938.9 KiB
/images/18.2fd6983b19d8b889c442dc/1776250820618/mp1424393...	881.8 KiB
www.su.se/images/18.52d6207619c988d3d5c3206/1773651165101/(2)%20RUT.jpg	639.3 KiB

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

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoid long main-thread tasks 20 long tasks found

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

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 40 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 40 ms

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

○Avoid large layout shifts

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>`

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

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

●Buttons have an accessible name

●`[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

●Background and foreground colors have a sufficient contrast ratio

●Links are distinguishable without relying on color.

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

○`[accesskey]` values are unique

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

○Deprecated ARIA roles were not used

○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

○`[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

○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

○Document has a `<title>` element

○ARIA IDs are unique

○No form fields have multiple labels

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

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

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

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

○Image elements have `[alt]` attributes

○Input buttons have discernible text.

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

○Form elements have associated labels

○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

○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"]`

○Document has a main landmark.

○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.

○Elements with visible text labels have matching accessible names.

○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
Specifying overflow: visible on img, video and canvas tags may cause them to produce visual content outside of the element bounds. See https://github.com/WICG/shared-element-transitions/blob/main/debugging_overflow_on_images.md.	www.su.se/

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

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

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○Document has a `<title>` element

○Image elements have `[alt]` attributes