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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.

47

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
cdn.poool.fr/uploads/608d4bcfa8442b00336ab1d4/original/1024x1024ia%20(1).png3600.0 s152.1 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s71.6 KiB
sdk.mrf.io/statics/marfeel-sdk.js?id=50351800.0 s59.4 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s63.8 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s52.0 KiB
/5fc0b695-8a88-4319-8a10-e2df49822357/loader.js?target=ww...7200.0 s42.2 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s39.2 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s37.9 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s37.8 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s35.2 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s31.4 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s25.9 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s25.2 KiB
sdk.mrf.io/statics/47bd3e88b6bda15c34ce.js3600.0 s24.4 KiB
tag.aticdn.net/piano-analytics.js14400.0 s26.6 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s21.2 KiB
assets.poool.fr/engage.min.js1800.0 s19.3 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s19.4 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s17.7 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s17.3 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s16.2 KiB
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...3600.0 s13.7 KiB
assets.poool.fr/lib-buddy.2.3.8-1771409338215.js1800.0 s12.5 KiB
/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/...14400.0 s13.4 KiB
assets.poool.fr/lib-sdk.2.3.8-1771409338215.js1800.0 s6.9 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.7 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.7 KiB
sdk.mrf.io/statics/compass-multimedia-sdk.js?version=22623600.0 s4.3 KiB
www.latribune.fr/next_images/svg/pub-LT.svg300.0 s2.4 KiB
www.latribune.fr/scripts/piano.js300.0 s1.3 KiB
www.latribune.fr/scripts/didomiLT.js300.0 s1.2 KiB
assets.latribune.fr/prod/public/next_images/logo/logo-lt-blue.svg3600.0 s1.2 KiB
cdn.poool.fr/uploads/608d4bcfa8442b00336ab1d4/original/icons8-croix-50.png3600.0 s1.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.
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.

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
head > link head > link
cdn.poool.fr/uploads/608d4bcfa8442b00336ab1d4/original/1024x1024ia%20(1).png151.5 KiB151.3 KiB
Le chantier Canopia à Bordeaux (Photo d’illustration) a.group > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...71.2 KiB69.6 KiB
La future usine d’Axens dédiée à la fabrication d’un composant essentiel pour l… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...63.3 KiB61.4 KiB
Le site doit permettre, à partir de 2030, de produire 34 000 tonnes par an d’hy… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...51.5 KiB50.0 KiB
Le caporal-chef Anicet Girardin faisait partie du 132e régiment d’infanterie cy… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...38.7 KiB36.8 KiB
Rachel Picard et Tim Jackson présentent la première rame TGV de Velvet à La Roc… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...37.3 KiB36.3 KiB
L'équipe VIT-S a.group > div.flex > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...37.4 KiB35.4 KiB
Bateau de la marque Jeanneau (Groupe Beneteau), le Sea Loft 480 propose une aut… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...34.7 KiB33.7 KiB
Le Haut conseil des finances publiques est un organisme indépendant, placé aupr… a.group > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...31.0 KiB30.1 KiB
Nicolas Isnard, président d'Aix-Marseille Provence, veut une métropole "des mai… a.group > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...25.5 KiB24.7 KiB
La Tribune Business a.group > div.flex > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...24.8 KiB23.7 KiB
L’oléoduc Droujba part de l’est de la Russie et traverse une bonne partie de l’… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...20.1 KiB19.6 KiB
Alphabet a grimpé de 14 % en Bourse en un mois pour dépasser les 4 000 milliard… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...18.9 KiB18.4 KiB
Brad Lightcap (OpenAI) lors du Festival international de la créativité Cannes L… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...16.9 KiB16.4 KiB
Le canal de Panama a vu son trafic augmenter de +9 % en mars par rapport à janv… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...15.8 KiB15.4 KiB
Encore en attente de certification, le Boeing 777-9 est l'avion de nouvelle gén… div.flex > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...13.3 KiB12.7 KiB
Le ministre de la Transition Écologique, Mathieu Lefèvre, appelle les services … div.mt-4 > div.relative > div.relative > img.relative!
/cdn-cgi/image/width=750,format=auto,quality=75/media/mel...17.2 KiB12.1 KiB

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: 802 ms
URLTime Spent
latribune.fr/802 ms
www.latribune.fr/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

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.

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.

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 Evaluation2.2 s
Other1.2 s
Style & Layout540 ms
Script Parsing & Compilation268 ms
Parse HTML & CSS126 ms
Garbage Collection101 ms
Rendering88 ms

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: 0.0 ms 14.0 KiB
URLTransfer SizeEst Savings
16.6 KiB14.0 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
Logo div.didomi-popup-container > div.didomi-popup-view > div.didomi-popup-notice-logo-container > img.didomi-popup-notice-logo
assets.latribune.fr/prod/public/next_images/logo/logo-lt-blue.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
Forced reflow
LCP breakdown
LCP request discovery
Modern HTTP
Optimize viewport for mobile
Minify CSS
Minify JavaScript
User Timing marks and measures 3 user timings
Avoid long main-thread tasks 13 long tasks found
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 30 ms
Server Backend Latencies 60 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 50 ms
Avoid large layout shifts 1 layout shift found
INP breakdown
Avoid non-composited animations
89

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
Économie Finance Tech & IA Énergie & industrie Transports Défense & aérospatial… div.transition-all > div.bg-white > nav.text-[14px] > div.relative

Using ARIA attributes in roles where they are prohibited can mean that important information is not communicated to users of assistive technologies. Learn more about prohibited ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Description de la newsletter div.flex > div.border > div.px-[8px] > p.flex-1

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
Partenaire div.flex > div.flex > span > span.text-[12px]
Partenaire div.flex > div.flex > span > span.text-[12px]
Partenaire div.flex > div.flex > span > span.text-[12px]
23 avril 2026 div.pt-[20px] > div > p.text-[12px] > span.font-semibold

These are opportunities to improve the legibility of your content.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Mathieu Lefèvre : « Il faut engager un changement de culture administrative en … section#main-content > div.mb-8 > article > a.group
Emmanuel Macron veut accélérer les « cathédrales industrielles » comme la mine … div.grid > div.py-8 > article > a.group
Comment Google pourrait rafler le jackpot du siècle avec SpaceX Industrie finan… div.grid > div.py-8 > article > a.group
Pour éviter un dérapage du budget 2026, le gouvernement devra tenir parole sur … div.grid > div.py-8 > article > a.group
Comment la Métropole Aix-Marseille Provence tente d'éviter la tutelle de l'Etat… div.grid > div.py-8 > article > a.group
La fin des chaudières à gaz va renchérir le prix des logements neufs Immobilier div.grid > div.py-8 > article > a.group
TGV : Velvet promet des nouveaux trains sur l'axe Atlantique, mais pas des bill… div.grid > div.py-8 > article > a.group
Exclusif Batteries : le projet d’usine de cathodes d’Axens dans les Hauts-de-Fr… div.grid > div.py-8 > article > a.group
Le blocage du détroit d’Ormuz booste le trafic et les recettes du canal de Pana… div.grid > div.py-8 > article > a.group
Droujba : l’Ukraine rouvre le robinet au pétrole russe et s’apprête à recevoir … div.grid > div.py-8 > article > a.group
Boeing : la défense et la maintenance, boucliers d'un géant en convalescence Aé… div.grid > div.py-8 > article > a.group
Beneteau et Fountaine Pajot s’allient pour développer les voiliers à propulsion… div.grid > div.py-8 > article > a.group
Derrière ChatGPT, OpenAI se lance à l'assaut du marché des entreprises avec « D… div.grid > div.py-8 > article > a.group
Un deuxième militaire français de la Finul est mort des suites de ses blessures… div.grid > div.py-8 > article > a.group
Recyclage : la valorisation des eaux non conventionnelles s'accélère Energie et… div.grid > div.py-8 > article > a.group
« La reprise économique attendue cette année est une fois de plus freinée »  : … div.grid > div.py-8 > article > a.group
Carburants : le coût des aides estimé à 180 millions d’euros en mai Économie div.grid > div.py-8 > article > a.group
Christophe Ono-dit-Biot, Anne de Marcken, Pierre Assouline, Jay McInerney… Notr… div.grid > div.py-8 > article > a.group
Danone, Bureau Veritas, Eurofins, FDJ : moisson de résultats décevants pour des… div.grid > div.py-8 > article > a.group
1 Batteries : le projet d’usine de cathodes d’Axens dans les Hauts-de-France d… div.w-full > ul.mt-[40px] > li.relative > a.flex
2 Société Générale Côte d’Ivoire, une machine à cash sur un continent que le g… div.w-full > ul.mt-[40px] > li.relative > a.flex
3 La France dégaine un plan pour embaucher 600 000 personnes dans l'industrie … div.w-full > ul.mt-[40px] > li.relative > a.flex
4 Le blocage du détroit d’Ormuz booste le trafic et les recettes du canal de P… div.w-full > ul.mt-[40px] > li.relative > a.flex
5 La « stratégie Notre-Dame » : comment l'Élysée veut accélérer 71 milliards d… div.w-full > ul.mt-[40px] > li.relative > a.flex
6 Pierre Gallet (Urssaf) : « Les entreprises éphémères représentent un enjeu f… div.w-full > ul.mt-[40px] > li.relative > a.flex
La fin des chaudières à gaz va renchérir le prix des logements neufs Article Pr… div.border-b > div.flex > article.flex-1 > a.group
Comment la Métropole Aix-Marseille Provence tente d'éviter la tutelle de l'Etat… div.flex > div.flex-1 > article.pt-[20px] > a.group
Pour éviter un dérapage du budget 2026, le gouvernement devra tenir parole sur … div.flex > div.flex-1 > article.pt-[20px] > a.group
« La reprise économique attendue cette année est une fois de plus freinée »  : … div.flex > div.flex-1 > article.pt-[20px] > a.group
Carburants : le coût des aides estimé à 180 millions d’euros en mai Économie div.flex > div.flex-1 > article.pt-[20px] > a.group
Un deuxième militaire français de la Finul est mort des suites de ses blessures… div.flex > div.flex > article.flex-1 > a.group
Christophe Ono-dit-Biot, Anne de Marcken, Pierre Assouline, Jay McInerney… Notr… div.flex > div.flex > article.flex-1 > a.group
« Les filles s’éclatent à l’entraînement » : au FC Nantes, l'équipe féminine vi… div.flex > div.flex > article.flex-1 > a.group
Boeing : la défense et la maintenance, boucliers d'un géant en convalescence Aé… div.border-b > div.flex > article.flex-1 > a.group
Défense, climat : le prix de la solidarité financière européenne Finances Publi… div.flex > div.flex-1 > article.pt-[20px] > a.group
Armement : le campus de Bourges veut former aux nouveaux métiers de la pyrotech… div.flex > div.flex-1 > article.pt-[20px] > a.group
Spatial : les satellites d'Airbus exploités pour la première cartographie mondi… div.flex > div.flex-1 > article.pt-[20px] > a.group
SpaceX : trois jours au cœur de la machine pour convaincre Wall Street Spatial div.flex > div.flex-1 > article.pt-[20px] > a.group
Electro Dépôt défie Weber avec ce barbecue Valberg à moins de 60 € L’Instant Sé… div.flex > div.flex > article.flex-1 > a.group
Ninja Air Fryer : l’appareil star qui réduit votre facture d’énergie passe sous… div.flex > div.flex > article.flex-1 > a.group
LEGO Star Wars Casque Captain Rex voit son prix dégringoler de -27% L’Instant S… div.flex > div.flex > article.flex-1 > a.group
Comment Google pourrait rafler le jackpot du siècle avec SpaceX Article Premium… div > div.flex > article.flex-1 > a.group
Derrière ChatGPT, OpenAI se lance à l'assaut du marché des entreprises avec « D… div.flex > div.flex-1 > article.pt-[20px] > a.group
Entreprises : « Pour que l'IA soit adoptée, il ne faut pas qu'elle menace de re… div.flex > div.flex-1 > article.pt-[20px] > a.group
SpaceX : trois jours au cœur de la machine pour convaincre Wall Street Spatial div.flex > div.flex-1 > article.pt-[20px] > a.group
Exclusif Audio connecté : l'allemand Loewe Technology reprend la pépite montpel… div.flex > div.flex-1 > article.pt-[20px] > a.group
Comment Google pourrait rafler le jackpot du siècle avec SpaceX Article Premium… div.flex > div.flex > article.flex-1 > a.group
Défense, climat : le prix de la solidarité financière européenne Finances Publi… div.flex > div.flex > article.flex-1 > a.group
Les banques régionales solides sur les fonds Article Premium Économie div.flex > div.flex > article.flex-1 > a.group
Exclusif Mathieu Lefèvre : « Il faut engager un changement de culture administr… div > div.flex > article.flex-1 > a.group
La fin des chaudières à gaz va renchérir le prix des logements neufs Article Pr… div.flex > div.flex-1 > article.pt-[20px] > a.group
Droujba : l’Ukraine rouvre le robinet au pétrole russe et s’apprête à recevoir … div.flex > div.flex-1 > article.pt-[20px] > a.group
Beneteau et Fountaine Pajot s’allient pour développer les voiliers à propulsion… div.flex > div.flex-1 > article.pt-[20px] > a.group
Recyclage : la valorisation des eaux non conventionnelles s'accélère Article Pr… div.flex > div.flex-1 > article.pt-[20px] > a.group
Comment la Métropole Aix-Marseille Provence tente d'éviter la tutelle de l'Etat… div.flex > div.flex > article.flex-1 > a.group
TGV : Velvet promet des nouveaux trains sur l'axe Atlantique, mais pas des bill… div.flex > div.flex > article.flex-1 > a.group
Exclusif Batteries : le projet d’usine de cathodes d’Axens dans les Hauts-de-Fr… div.flex > div.flex > article.flex-1 > a.group
La fin des chaudières à gaz va renchérir le prix des logements neufs Article Pr… div > div.flex > article.flex-1 > a.group
Recyclage : la valorisation des eaux non conventionnelles s'accélère Article Pr… div.flex > div.flex-1 > article.pt-[20px] > a.group
Défense, climat : le prix de la solidarité financière européenne Finances Publi… div.flex > div.flex-1 > article.pt-[20px] > a.group
Face aux États-Unis, le difficile chemin de crête de la France pour son G7 envi… div.flex > div.flex-1 > article.pt-[20px] > a.group
Spatial : les satellites d'Airbus exploités pour la première cartographie mondi… div.flex > div.flex-1 > article.pt-[20px] > a.group
cliquez ici div.space-y-20 > div.mx-auto > p > button.text-[14px]
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
Image elements have `[alt]` attributes
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
ARIA attributes are used as specified for the element's role
Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
`[aria-hidden="true"]` elements do not contain focusable descendents
Document has a `<title>` element
`<frame>` or `<iframe>` elements have a title
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
Links have a discernible name
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
No element has a `[tabindex]` value greater than 0
Touch targets have sufficient size and spacing.
`[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
ARIA IDs are unique
All heading elements contain content.
Uses ARIA roles only on compatible elements
Identical links have the same purpose.
`[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
No form fields have multiple labels
`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
Input buttons have discernible text.
`<input type="image">` elements have `[alt]` text
Form elements have associated labels
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.
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>`.
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.
81

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 / WarningSource
SharedStorage
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.
Fledge

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.

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
Ensure proper origin isolation with COOP
Mitigate DOM-based XSS with Trusted Types
Detected JavaScript libraries
Redirects HTTP traffic to HTTPS
Use a strong HSTS policy
Mitigate clickjacking with XFO or CSP
100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

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

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