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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.

45

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
/o/ub-theme/css/main.css?browserId=chrome&themeId=ub_WAR_...3600.0 s117.1 KiB
web.ub.edu/image/company_logo?img_id=45626902&t=17764105476673600.0 s97.5 KiB
/o/ub-theme/css/clay.css?browserId=chrome&themeId=ub_WAR_...3600.0 s69.7 KiB
web.ub.edu/o/ub-theme/fonts/roboto/roboto_medium/Roboto-Medium.woff23600.0 s49.1 KiB
web.ub.edu/o/ub-theme/fonts/roboto/roboto_bold/Roboto-Bold.woff23600.0 s48.8 KiB
web.ub.edu/o/ub-theme/fonts/roboto/roboto_regular/Roboto-Regular.woff23600.0 s48.1 KiB
consent.cookiebot.com/uc.js247.0 s35.7 KiB
static.hotjar.com/c/hotjar-1859237.js?sv=760.0 s6.2 KiB
cse.google.com/cse.js?cx=fdf6bc2e2504c890e0.0 ms3.7 KiB
/consentconfig/88355e31-7fef-4d33-b6e9-f715351dd339/web.u...71381.0 s1.5 KiB
web.ub.edu/o/ub-theme/images/ico/icon-close.svg3600.0 s580 B
web.ub.edu/o/ub-theme/images/ico/icon-close-black.svg3600.0 s580 B
web.ub.edu/o/frontend-js-web/liferay/modal/Modal.css3600.0 s407 B
web.ub.edu/o/ub-theme/images/ico/Search.svg3600.0 s306 B
/o/frontend-js-aui-web/alloy_ui.css?&mac=favIEq7hPo8AEd6k...3600.0 s184 B
web.ub.edu/o/frontend-js-web/css/notification.css3600.0 s166 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.

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
Un atles, un catàleg jesuïta i un sermó, protagonistes de la nova campanya Apad… div.journal-content-article > div.ub-modal-gallery > div.ub-modal-item > img
/documents/2685349/6785461/AF_APADRINA26_CanalsUB_ONLINE_...228.5 KiB215.6 KiB
La UB presenta al CRAI de Belles Arts el cartell de Sant Jordi 2026, signat per… div.journal-content-article > div.ub-modal-gallery > div.ub-modal-item > img
/documents/2685349/6785461/cartell_SJ26_destacadafora.jpg...209.9 KiB196.9 KiB
div.journal-content-article > div.ub-modal-gallery > div.ub-modal-item > img div.journal-content-article > div.ub-modal-gallery > div.ub-modal-item > img
/documents/2685349/6785461/novetats-edicionsUB-2026_a.jpg...131.1 KiB118.1 KiB
Ves a Universitat de Barcelona div#heading > div.site-title > a.logo > img
web.ub.edu/image/company_logo?img_id=45626902&t=177641054766797.4 KiB73.7 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: La UB presenta al CRAI de Belles Arts el cartell de Sant Jordi 2026, signat per…
path: 1,HTML,1,BODY,0,DIV,6,DIV,0,DIV,1,SECTION,1,DIV,1,DIV,0,DIV,2,DIV,0,DIV,0,DIV,1,SECTION,0,DIV,1,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG
selector: div.journal-content-article > div.ub-modal-gallery > div.ub-modal-item > img
snippet: <img alt="La UB presenta al CRAI de Belles Arts el cartell de Sant Jordi 2026, signa…" src="/documents/2685349/6785461/cartell_SJ26_destacadafora.jpg/526f7dda-c78c-9b…" loading="lazy">

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
cse.google.com/cse.js?cx=fdf6bc2e2504c890e3.7 KiB833 ms
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...107.7 KiB600 ms
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...77.2 KiB450 ms
web.ub.edu/o/ub-theme/js/glider/glider.min.js3.0 KiB
/o/frontend-js-loader-modules-extender/loader.js?&mac=9Wa...6.5 KiB
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...381 B
/combo?browserId=chrome&minifierType=css&themeId=ub_WAR_u...3.0 KiB150 ms
consent.cookiebot.com/uc.js35.7 KiB1.3 s
/o/ub-theme/css/main.css?browserId=chrome&themeId=ub_WAR_...117.1 KiB900 ms
/o/ub-theme/css/clay.css?browserId=chrome&themeId=ub_WAR_...69.7 KiB750 ms
/o/frontend-js-aui-web/alloy_ui.css?&mac=favIEq7hPo8AEd6k...184 B

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: 783 ms
URLTime Spent
ub.edu/783 ms
web.ub.edu/web/ub/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

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 24.6 KiB
URLTransfer SizeEst Savings
/o/ub-theme/css/clay.css?browserId=chrome&themeId=ub_WAR_...69.7 KiB12.3 KiB
/o/ub-theme/css/main.css?browserId=chrome&themeId=ub_WAR_...117.1 KiB12.3 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 10.4 KiB
URLTransfer SizeEst Savings
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...77.0 KiB10.4 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: 630 ms 191.8 KiB
URLTransfer SizeEst Savings
/o/ub-theme/css/main.css?browserId=chrome&themeId=ub_WAR_...117.0 KiB112.4 KiB
/o/ub-theme/css/clay.css?browserId=chrome&themeId=ub_WAR_...69.6 KiB68.7 KiB
13.5 KiB10.7 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: 1.9 s 344.6 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-MLPG24R175.6 KiB71.3 KiB
www.googletagmanager.com/gtag/js?id=G-5BRF8HTDBV&cx=c&gtm=4e64h1150.6 KiB63.5 KiB
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...77.0 KiB58.3 KiB
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...107.6 KiB52.5 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js56.1 KiB37.7 KiB
web.ub.edu/o/frontend-taglib-clay/__liferay__/exports/@clayui$core.js43.6 KiB34.0 KiB
/88355e31-7fef-4d33-b6e9-f715351dd339/cc.js?renew=false&r...131.8 KiB27.4 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.

URLTotal CPU TimeScript EvaluationScript Parse
consent.cookiebot.com/uc.js1.1 s667 ms17 ms
Unattributable642 ms46 ms0.0 ms
web.ub.edu/web/ub/594 ms28 ms13 ms
web.ub.edu/o/frontend-js-spa-web/__liferay__/index.js338 ms322 ms0.2 ms
www.googletagmanager.com/gtm.js?id=GTM-MLPG24R282 ms223 ms56 ms
www.googletagmanager.com/gtag/js?id=G-5BRF8HTDBV&cx=c&gtm=4e64h1257 ms219 ms32 ms
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...236 ms159 ms30 ms
script.hotjar.com/modules.6a0f3932cb1341a35c18.js168 ms142 ms21 ms
/combo?browserId=chrome&minifierType=js&languageId=ca_ES&...91 ms50 ms21 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.

CategoryTime Spent
Script Evaluation1.9 s
Other784 ms
Style & Layout482 ms
Parse HTML & CSS409 ms
Script Parsing & Compilation296 ms
Rendering28 ms
Garbage Collection15 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 reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
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.

URLTransfer Size
/documents/2685349/6785461/AF_APADRINA26_CanalsUB_ONLINE_...228.6 KiB
/documents/2685349/6785461/cartell_SJ26_destacadafora.jpg...210.0 KiB
/documents/2685349/6785461/Jardíndp.jpg/8434d795-46cf-f9...206.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-MLPG24R176.0 KiB
www.googletagmanager.com/gtag/js?id=G-5BRF8HTDBV&cx=c&gtm=4e64h1150.7 KiB
/documents/2685349/2686580/marca_peu_150.png.jpg/d1edc411...146.7 KiB
/88355e31-7fef-4d33-b6e9-f715351dd339/cc.js?renew=false&r...132.0 KiB
/documents/2685349/6785461/novetats-edicionsUB-2026_a.jpg...131.1 KiB
/documents/2685349/2690148/oferta+formativa.jpg/4eb527fa-...123.1 KiB
/o/ub-theme/css/main.css?browserId=chrome&themeId=ub_WAR_...117.1 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
Red Vives ul.institucional-links > li > a > img
/documents/2685349/2686580/xarxa-vives.svg/b88fd4f8-a2ad-...
LERU ul.institucional-links > li > a > img
/documents/2685349/2686580/leru.svg/86b79a07-9ec5-05da-a8...
Excel·lència internacional HR ul.institucional-links > li > a > img
/documents/2685349/2686580/hr.svg/f01a0bc8-fb54-444b-e30e...
div.container-xl > div.options > button.btnSearch > img.icon-show div.container-xl > div.options > button.btnSearch > img.icon-show
web.ub.edu/o/ub-theme/images/ico/Search.svg
Charm-EU li > a > picture > img
/documents/2685349/2686580/charm-eu.png/acfeb475-bbbc-d63...
Charter for Higher Education li > a > picture > img
/o/adaptive-media/image/5228710/Preview-1000x0/MicrosoftT...

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
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●User Timing marks and measures 5 user timings
●Avoid long main-thread tasks 15 long tasks found
●Network Requests
●Network Round Trip Times 50 ms
●Server Backend Latencies 480 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 110 ms
○INP breakdown
○Avoid non-composited animations
○Avoid large layout shifts
97

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.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Avís legal div.row > div.col-6 > ul.terminos > li
Galetes div.row > div.col-6 > ul.terminos > li
Accessibilitat div.row > div.col-6 > ul.terminos > li
Contacte div.row > div.col-6 > ul.terminos > li
Botiga UB div.row > div.col-6 > ul.terminos > li
Edicions UB div.row > div.col-6 > ul.terminos > li
Lloguer d’espais div.row > div.col-6 > ul.terminos > li
Seu electrònica div.row > div.col-xl-3 > ul.destacados > li
Portal de transparència div.row > div.col-xl-3 > ul.destacados > li
Bústia ètica div.row > div.col-xl-3 > ul.destacados > li

These are opportunities to improve the experience of reading tabular or list data using 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
●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
●`[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.
●Select elements have associated label elements.
●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
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
○`[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 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
○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○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.
○`<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.
○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.
92

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
Ves a Universitat de Barcelona div.row > div.logo > a.p-0 > img
/documents/2685349/2686580/marca_peu_150.png.jpg/d1edc411...268 x 73 (3.67)984 x 250 (3.94)

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.

SourceDescription
web.ub.edu/o/ub-theme/js/glider/glider.min.js line 15, col 207
TypeError: Cannot read properties of null (reading '_glider') at new a.Glider (https://web.ub.edu/o/ub-theme/js/glider/glider.min.js:16:208) at Object.<anonymous> (https://web.ub.edu/web/ub/:1322:30) at e.Subscriber._notify (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:361:51) at e.Subscriber.notify (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:361:245) at e.CustomEvent._notify (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:360:4257) at e.CustomEvent._procSubs (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:360:4916) at u.fireComplex (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:364:1402) at e.CustomEvent._fire (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:360:4519) at Object.fire (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:361:5483) at Object.onLoad (https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js:2951:13)
web.ub.edu/web/ub/ line 1223, col 20
TypeError: Cannot read properties of null (reading 'addEventListener') at HTMLDocument.<anonymous> (https://web.ub.edu/web/ub/:1224:21)
web.ub.edu/web/ub/ line 1223, col 20
TypeError: Cannot read properties of null (reading 'addEventListener') at HTMLDocument.<anonymous> (https://web.ub.edu/web/ub/:1224:21) at window.CookieControl.Cookie.applyOverrideEventListeners (https://consent.cookiebot.com/uc.js:2:108581) at https://consent.cookiebot.com/uc.js:2:17334
●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
●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 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
92

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

Canonical links suggest which URL to show in search results. Learn more about canonical links.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

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
●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`

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