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
/ca/media/destacats-home/sense-plastic-home-2.png/@@image...	86400.0 s	211.1 KiB
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js	86400.0 s	176.9 KiB
/ca/media/destacats-home/microcredencials_upcschool.png/@...	86400.0 s	153.1 KiB
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.css	86400.0 s	152.4 KiB
/ca/media/r-d-i/foment-i-suport-a-la-recerca/7-beques-doc...	86400.0 s	134.5 KiB
/ca/media/destacats-home/esports-femeni-home.jpg/@@images...	86400.0 s	61.7 KiB
privacy-proxy.usercentrics.eu/latest/uc-block.bundle.js	3600.0 s	30.5 KiB
/ca/media/destacats-home/formula-student-home.jpg/@@image...	86400.0 s	54.0 KiB
/ca/media/destacats-home/becamec_2026-700x350px.png/@@ima...	86400.0 s	52.6 KiB
/ca/media/destacats-home/franja-grisa-ca.jpg/@@images/12d...	86400.0 s	41.9 KiB
/ca/per-que-estudiar-un-master-a-la-upc/src/masters-si-we...	86400.0 s	31.1 KiB
/++theme++homeupc/assets/css/homeupc-compiled.css?version...	86400.0 s	28.1 KiB
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
/ca/media/empresa/noia-horitzontal-prestigi-2018.jpg/@@im...	86400.0 s	21.9 KiB
app.usercentrics.eu/browser-ui/latest/loader.js	3600.0 s	10.8 KiB
/++theme++homeupc/assets/fonts/bootstrap/glyphicons-halfl...	86400.0 s	19.2 KiB
/++theme++homeupc/assets/fonts/roboto/KFOjCnqEu92Fr1Mu51T...	86400.0 s	18.7 KiB
/++theme++homeupc/assets/css/upc.css?version=2026-01-26%2...	86400.0 s	17.9 KiB
www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmEU9fBBc4.woff2	86400.0 s	17.2 KiB
www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmWUlfBBc4.woff2	86400.0 s	17.1 KiB
www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmSU5fBBc4.woff2	86400.0 s	17.0 KiB
/ca/media/fons_destacat_menu_carbassa.jpg/@@images/d5176e...	86400.0 s	14.3 KiB
/ca/media/fons_destacat_menu_lila.jpg/@@images/39d02c7d-9...	86400.0 s	13.6 KiB
/ca/media/fons_destacat_menu_blau.jpg/@@images/55782bcc-0...	86400.0 s	12.3 KiB
/++theme++homeupc/assets/javascripts/homeupc-compiled.js?...	86400.0 s	11.7 KiB
www.upc.edu/++theme++homeupc/assets/fonts/upc-icones.ttf?40tf5e	86400.0 s	10.0 KiB
www.upc.edu/++theme++homeupc/assets/images/Logo.svg	86400.0 s	5.4 KiB
/++theme++homeupc/assets/javascripts/upc.min.js?version=2...	86400.0 s	3.0 KiB
www.upc.edu/++theme++homeupc/assets/javascripts/lang_tag.js	86400.0 s	1.9 KiB
app.usercentrics.eu/session/1px.png?settingsId=k73tMWYfS	1800.0 s	817 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:58.314 source:map[column:30286 line:2 type:source-location url:https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.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:85.882 source:map[type:text value:[unattributed]]] map[reflowTime:58.314 source:map[column:31379 line:1 type:source-location url:https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.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
Microcredencials universitàries `div.row > div.col-xs-12 > a.btn-banner > img.image-inline`	/ca/media/destacats-home/microcredencials_upcschool.png/@...	151.5 KiB	139.2 KiB
Luiz Inácio Lula da Silva amb representants del BSC i la UPC, entre d'altres, v… `div.area4 > div.card > picture > img`	/ca/sala-de-premsa/noticies/els-presidents-del-brasil-uru...	137.1 KiB	128.7 KiB
div.area5 > div.card > picture > img `div.area5 > div.card > picture > img`	/ca/sala-de-premsa/noticies/creen-teixits-vius-capacos-ca...	129.0 KiB	120.5 KiB
Blau 3005. Càpsules d'aprenentatge `div.row > div.col-xs-12 > a.btn-banner > img.image-inline`	/ca/media/r-d-i/foment-i-suport-a-la-recerca/7-beques-doc...	132.9 KiB	116.0 KiB
La presentació de l'Espai de Dades Agroalimentari, a l'Auditori del Vèrtex `div.area3 > div.card > picture > img`	/ca/sala-de-premsa/noticies/upc-presenta-espai-dades-agro...	123.3 KiB	114.9 KiB
Cartell de la campanya de promoció dels estudis: UPC, la millor decisió de la t… `div.mosaic-tile-content > section#hero > picture > img`	/ca/continguts-home/foto-portada/jornades-portes-obertes-...	211.5 KiB	110.3 KiB
Alumnes a l'edició del CanSat 2024-25 `div.area2 > div.card > picture > img`	/ca/sala-de-premsa/noticies/arriba-gran-final-catalana-co...	117.2 KiB	108.8 KiB
div.area1 > div.card > picture > img `div.area1 > div.card > picture > img`	/ca/sala-de-premsa/noticies/es-presenta-leia-upc-programa...	114.3 KiB	105.9 KiB
La UPC, a la CapitalitatMundial de l'Arquitectura 2026 `div.container > div.promo-img > picture > img`	/ca/continguts-home/promocio/la-upc-a-la-capitalitat-mund...	155.4 KiB	99.7 KiB
Cartell Teoría Cerdà `div.area7 > div.card > picture > img`	/ca/sala-de-premsa/noticies/llibre-teoria-cerda-publicat-...	100.2 KiB	91.8 KiB
div.area8 > div.card > picture > img `div.area8 > div.card > picture > img`	/ca/sala-de-premsa/noticies/upc-presenta-infraestructura-...	74.6 KiB	65.8 KiB
Beques i ajuts `div.row > div.col-xs-12 > a.btn-banner > img.image-inline`	/ca/media/destacats-home/becamec_2026-700x350px.png/@@ima...	51.0 KiB	36.1 KiB
div.container > div.promo-img > picture > img `div.container > div.promo-img > picture > img`	/ca/continguts-home/promocio/sessions-de-masters-universi...	91.4 KiB	35.7 KiB
Cartell de les Eleccions al Claustre Universitari 2026 `div.area6 > div.card > picture > img`	/ca/sala-de-premsa/noticies/eleccions-al-claustre-univers...	41.8 KiB	33.4 KiB
Portal futurs estudiants `div.row > div.col-xs-12 > a.btn-banner > img.image-inline`	/ca/media/destacats-home/franja-grisa-ca.jpg/@@images/12d...	40.3 KiB	24.7 KiB
Sessions informatives de màster `div.row > div.col-xs-12 > a.btn-banner > img.image-inline`	/ca/per-que-estudiar-un-master-a-la-upc/src/masters-si-we...	29.5 KiB	13.9 KiB
div.area-gran > div.card > picture > img.card-img-top `div.area-gran > div.card > picture > img.card-img-top`	/ca/sala-de-premsa/noticies/la-universitat-politecnica-de...	79.3 KiB	9.9 KiB
Màster i postgraus de formació contínua `div.row > div.col-xs-12 > a.btn-banner > img.image-inline`	/ca/media/empresa/noia-horitzontal-prestigi-2018.jpg/@@im...	20.2 KiB	8.0 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-5-IMG

nodeLabel: Cartell de la campanya de promoció dels estudis: UPC, la millor decisió de la t…

path: 1,HTML,1,BODY,1,MAIN,1,SECTION,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,2,SECTION,0,PICTURE,2,IMG

selector: div.mosaic-tile-content > section#hero > picture > img

snippet: <img src="https://www.upc.edu/ca/continguts-home/foto-portada/jornades-portes-oberte…" alt="Cartell de la campanya de promoció dels estudis: UPC, la millor decisió de…" width="2222" height="981">

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
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js	176.9 KiB	564 ms
/++theme++homeupc/assets/javascripts/homeupc-compiled.js?...	11.7 KiB	264 ms
/++theme++homeupc/assets/javascripts/upc.min.js?version=2...	3.0 KiB	221 ms
/++theme++homeupc/assets/css/homeupc-compiled.css?version...	28.1 KiB	307 ms
/++theme++homeupc/assets/css/upc.css?version=2026-01-26%2...	17.9 KiB	264 ms
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.css	152.4 KiB	521 ms

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.upc.edu/ca	http/1.1
www.upc.edu/++theme++homeupc/assets/javascripts/lang_tag.js	http/1.1
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.css	http/1.1
/++theme++homeupc/assets/css/homeupc-compiled.css?version...	http/1.1
/++theme++homeupc/assets/css/upc.css?version=2026-01-26%2...	http/1.1
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js	http/1.1
/++theme++homeupc/assets/javascripts/homeupc-compiled.js?...	http/1.1
/++theme++homeupc/assets/javascripts/upc.min.js?version=2...	http/1.1
www.upc.edu/++theme++homeupc/assets/images/Logo.svg	http/1.1
/ca/media/fons_destacat_menu_carbassa.jpg/@@images/d5176e...	http/1.1
/ca/media/fons_destacat_menu_blau.jpg/@@images/55782bcc-0...	http/1.1
/ca/media/fons_destacat_menu_lila.jpg/@@images/39d02c7d-9...	http/1.1
/ca/continguts-home/foto-portada/jornades-portes-obertes-...	http/1.1
/ca/sala-de-premsa/noticies/la-universitat-politecnica-de...	http/1.1
/ca/media/destacats-home/franja-grisa-ca.jpg/@@images/12d...	http/1.1
/ca/per-que-estudiar-un-master-a-la-upc/src/masters-si-we...	http/1.1
/ca/media/destacats-home/becamec_2026-700x350px.png/@@ima...	http/1.1
/ca/media/r-d-i/foment-i-suport-a-la-recerca/7-beques-doc...	http/1.1
/ca/media/empresa/noia-horitzontal-prestigi-2018.jpg/@@im...	http/1.1
/ca/media/destacats-home/microcredencials_upcschool.png/@...	http/1.1
/ca/continguts-home/promocio/sessions-de-masters-universi...	http/1.1
/ca/continguts-home/promocio/la-upc-a-la-capitalitat-mund...	http/1.1
/ca/continguts-home/espai-multimedia/upc-la-millor-decisi...	http/1.1
/ca/continguts-home/espai-multimedia/durbec-aero-start-up...	http/1.1
/ca/continguts-home/espai-multimedia/descobreix-el-labora...	http/1.1
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide5.jpeg	http/1.1
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide6.jpeg	http/1.1
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide7.jpeg	http/1.1
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide8.jpeg	http/1.1
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide9.jpeg	http/1.1
/ca/media/destacats-home/carrusel-ranquings/carrusel_2021...	http/1.1
www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmEU9fBBc4.woff2	http/1.1
www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmSU5fBBc4.woff2	http/1.1
www.upc.edu/++theme++homeupc/assets/fonts/upc-icones.ttf?40tf5e	http/1.1
www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmWUlfBBc4.woff2	http/1.1
/ca/sala-de-premsa/noticies/es-presenta-leia-upc-programa...	http/1.1
/ca/sala-de-premsa/noticies/arriba-gran-final-catalana-co...	http/1.1
/ca/sala-de-premsa/noticies/upc-presenta-espai-dades-agro...	http/1.1
/ca/sala-de-premsa/noticies/els-presidents-del-brasil-uru...	http/1.1
/ca/sala-de-premsa/noticies/creen-teixits-vius-capacos-ca...	http/1.1
/ca/sala-de-premsa/noticies/eleccions-al-claustre-univers...	http/1.1
/ca/sala-de-premsa/noticies/llibre-teoria-cerda-publicat-...	http/1.1
/ca/sala-de-premsa/noticies/upc-presenta-infraestructura-...	http/1.1
/ca/media/destacats-home/formula-student-home.jpg/@@image...	http/1.1
/ca/media/destacats-home/esports-femeni-home.jpg/@@images...	http/1.1
/ca/media/destacats-home/sense-plastic-home-2.png/@@image...	http/1.1
www.upc.edu/ca/agenda/esdeveniments/sant-jordi-upc/@@images/imatge/large	http/1.1
www.upc.edu/ca/agenda/esdeveniments/forum-futur-civil/@@images/imatge/large	http/1.1
/ca/agenda/esdeveniments/36a-edicio-del-forum-etseib-2026...	http/1.1
www.upc.edu/ca/agenda/esdeveniments/foot-talent-day/@@images/imatge/large	http/1.1
/ca/continguts-home/als-mitjans/destaquem/rtve-informatiu...	http/1.1
/ca/continguts-home/als-mitjans/destaquem/la-vanguardia-u...	http/1.1
/ca/continguts-home/als-mitjans/destaquem/la-vanguardia-n...	http/1.1
/ca/continguts-home/als-mitjans/destaquem/el-mati-de-cata...	http/1.1
www.upc.edu/plonejsi18n?domain=widgets&language=ca	http/1.1
/++theme++homeupc/assets/fonts/roboto/KFOjCnqEu92Fr1Mu51T...	http/1.1
/++theme++homeupc/assets/fonts/bootstrap/glyphicons-halfl...	http/1.1
www.upc.edu/cross-domain-bridge.html	http/1.1
www.upc.edu/++theme++homeupc/assets/images/favicon.ico	http/1.1

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: 977 ms

URL	Time Spent
upc.edu/	507 ms
www.upc.edu/	470 ms
www.upc.edu/ca	0.0 ms

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: 130 ms 19.6 KiB

URL	Transfer Size	Est Savings
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js	175.3 KiB	19.6 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: 130 ms 187.5 KiB

URL	Transfer Size	Est Savings
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.css	150.7 KiB	150.1 KiB
/++theme++homeupc/assets/css/homeupc-compiled.css?version...	26.4 KiB	24.5 KiB
/++theme++homeupc/assets/css/upc.css?version=2026-01-26%2...	16.2 KiB	12.9 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: 210 ms 299.0 KiB

URL	Transfer Size	Est Savings
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js	169.2 KiB	91.9 KiB
www.googletagmanager.com/gtag/js?id=G-SR6Z9ZZ2SJ&cx=c&gtm=4e64k0	157.2 KiB	67.4 KiB
www.googletagmanager.com/gtag/js?id=G-P80Z250TEZ	154.6 KiB	61.9 KiB
app.usercentrics.eu/browser-ui/3.99.0/index.module.js	120.6 KiB	53.1 KiB
app.usercentrics.eu/browser-ui/3.99.0/VirtualServiceItem-e4cab338.js	48.6 KiB	24.8 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
/ca/media/destacats-home/carrusel-ranquings/carrusel_2021...	1.0 MiB
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide8.jpeg	920.9 KiB
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide7.jpeg	826.1 KiB
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide6.jpeg	332.6 KiB
/ca/continguts-home/foto-portada/jornades-portes-obertes-...	213.0 KiB
/ca/media/destacats-home/sense-plastic-home-2.png/@@image...	211.1 KiB
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js	176.9 KiB
www.upc.edu/ca/media/destacats-home/carrusel-ranquings/slide5.jpeg	157.5 KiB
www.googletagmanager.com/gtag/js?id=G-SR6Z9ZZ2SJ&cx=c&gtm=4e64k0	157.3 KiB
/ca/continguts-home/promocio/la-upc-a-la-capitalitat-mund...	157.0 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
div.container > div.promo-img > picture > img `div.container > div.promo-img > picture > img`	/ca/continguts-home/promocio/sessions-de-masters-universi...
La UPC, a la CapitalitatMundial de l'Arquitectura 2026 `div.container > div.promo-img > picture > img`	/ca/continguts-home/promocio/la-upc-a-la-capitalitat-mund...
BCN Motor Sport ETSEIB `div.container > div.row > div.col-xs-12 > img.image-inline`	/ca/media/destacats-home/formula-student-home.jpg/@@image...
Viu l'esport `div.container > div.row > div.col-xs-12 > img.image-inline`	/ca/media/destacats-home/esports-femeni-home.jpg/@@images...
div.container > div.row > div.col-xs-12 > img.image-inline `div.container > div.row > div.col-xs-12 > img.image-inline`	/ca/media/destacats-home/sense-plastic-home-2.png/@@image...
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`	/ca/continguts-home/espai-multimedia/upc-la-millor-decisi...
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`	/ca/continguts-home/espai-multimedia/durbec-aero-start-up...
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`	/ca/continguts-home/espai-multimedia/descobreix-el-labora...
Universitat Politècnica de Catalunya BarcelonaTech `a > h1 > span.icona-upc > img`	www.upc.edu/++theme++homeupc/assets/images/Logo.svg

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

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Optimize viewport for mobile

●Max Potential First Input Delay 60 ms

●Minify CSS

●User Timing marks and measures 10 user timings

●JavaScript execution time 0.5 s

●Minimizes main-thread work 1.3 s

●Avoid long main-thread tasks 2 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 100 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 100 ms

●Avoid large layout shifts 1 layout shift found

○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.

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Ves al contingut Ves al menú Informació per a... Seu Electrònica Contacte Idi… `div#header-menu > header.main-banner > nav#main-nav > ul.upc-eines`

When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
PRODUCTIVA la UPC, entre les universitats liders de l'Estat pel que fa al seu r… `div > div.container > div#carousel-example-generic > div.carousel-inner`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

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
Rebutja-ho tot `div.sc-cPiKLX > div.sc-koXPp > div.sc-bmzYkS > button.sc-gsFSXq`
Accepta-ho tot `div.sc-cPiKLX > div.sc-koXPp > div.sc-bmzYkS > button.sc-gsFSXq`

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
section > div.row > div.col-lg-4 > a.a-multimedia `section > div.row > div.col-lg-4 > a.a-multimedia`
section > div.row > div.col-lg-4 > a.a-multimedia `section > div.row > div.col-lg-4 > a.a-multimedia`
section > div.row > div.col-lg-4 > a.a-multimedia `section > div.row > div.col-lg-4 > a.a-multimedia`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

○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]`s are contained by their required parent element

●`[role]` values are valid

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

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

●Buttons have an accessible name

●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.

●`[accesskey]` values are unique

●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

●ARIA toggle fields have accessible names

●Document has a `<title>` element

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

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

●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.

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

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

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

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

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

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

○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

○Input buttons have discernible text.

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

○Links are distinguishable without relying on color.

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

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

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

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

○All heading elements contain content.

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

○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

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
www.upc.edu/ca line 26, col 8	`ReferenceError: uc is not defined at https://www.upc.edu/ca:27:9`

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Map URL
www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js	/++plone++production/++unique++2026-01-26T16:39:10.719273...

●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 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

○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.

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
li.col-md-3 > a.event-img > picture > img `li.col-md-3 > a.event-img > picture > img`
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`
div.col-lg-4 > a.a-multimedia > div.news-video > img `div.col-lg-4 > a.a-multimedia > div.news-video > img`

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

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`