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
/persee-search-portlet/webjars/font-awesome/7.0.0/webfont...	0.0 ms	99.3 KiB
www.persee.fr/persee-theme/css/fonts/ens/BebasNeueRegular-webfont.woff2	0.0 ms	16.1 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
www.persee.fr/persee-theme/css/fonts/ens/BebasNeueBold-webfont.woff2	0.0 ms	15.5 KiB
/html/js/liferay/available_languages.jsp?browserId=other&...	0.0 ms	1010 B

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/persee-search-portlet/webjars/font-awesome/7.0.0/webfont...	45 ms
www.persee.fr/persee-theme/css/fonts/ens/BebasNeueBold-webfont.woff2	20 ms
www.persee.fr/persee-theme/css/fonts/ens/BebasNeueRegular-webfont.woff2	20 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.persee_content-nobox > div.persee_content > div.content > img `div.persee_content-nobox > div.persee_content > div.content > img`	/documents/10099/1595712/Bandeau_RA2024.png/fc2d5a89-5408...	245.5 KiB	235.6 KiB
`div.persee_content > div.content > header#header-banner > section#banner`	/documents/10099/1609937/bandeau_versa/fe5e99f9-73fb-4b11...	158.2 KiB	123.8 KiB
Bluesky `section#follow-us > p > a > img`	/documents/10099/0/Bluesky_White.png/b483ef21-dbfc-4825-b...	84.9 KiB	84.9 KiB
div.content > p > a > img `div.content > p > a > img`	/documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5...	59.8 KiB	54.5 KiB
div.persee_content > div.content > a > img `div.persee_content > div.content > a > img`	/documents/10099/1367650/cbc.png/35c91685-2aae-4c3f-bb5c-...	56.4 KiB	51.4 KiB
div.persee_content > div.content > p > img `div.persee_content > div.content > p > img`	/documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-714...	49.2 KiB	42.9 KiB
div.content > p > a > img `div.content > p > a > img`	/documents/10099/1367650/cls.png/391a0243-e2d2-4591-806c-...	48.1 KiB	42.3 KiB
X `section#follow-us > p > a > img`	/documents/10099/0/X_logo_white.png/a20e15fc-1439-472b-94...	27.5 KiB	27.4 KiB
CNRS `section#partner > section#tutelles > a > img`	www.persee.fr/static/LOGO_CNRS_BLEU.png	18.6 KiB	18.5 KiB
Ministère de l'éducation nationale, de l'enseignement supérieur et de la recher… `section#partner > section#financeur > a > img`	/documents/10099/505733/MENESR_logo_portail.png/e9ae2f42-...	18.5 KiB	12.7 KiB
persee.fr `header#navi > section#site-title > a.logo > img`	www.persee.fr/static/persee.png	9.3 KiB	7.8 KiB
ENS Lyon `section#partner > section#tutelles > a > img`	/documents/10099/505733/ENS_2024-11/1a6cc584-1c59-4629-9c...	4.2 KiB	4.1 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-SECTION

nodeLabel:

path: 1,HTML,2,BODY,4,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,HEADER,0,SECTION

selector: div.persee_content > div.content > header#header-banner > section#banner

snippet: <section id="banner" style="background-image: url("/documents/10099/1609937/bandeau_versa/fe5e99f9-73fb…");">

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.persee.fr/	http/1.1
/persee-theme/css/aui.css?browserId=other&themeId=persee_...	http/1.1
/html/css/main.css?browserId=other&themeId=persee_WAR_per...	http/1.1
/html/portlet/asset_publisher/css/main.css?browserId=othe...	http/1.1
/persee-search-portlet/webjars/font-awesome/7.0.0/css/fon...	http/1.1
/persee-search-portlet/webjars/font-awesome/7.0.0/css/sol...	http/1.1
/persee-search-portlet/webjars/font-awesome/7.0.0/css/bra...	http/1.1
/html/portlet/journal/css/main.css?browserId=other&themeI...	http/1.1
/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_...	http/1.1
/html/portlet/journal/js/main.js?browserId=other&minifier...	http/1.1
/html/portlet/journal/js/navigation.js?browserId=other&mi...	http/1.1
/persee-theme/css/main.css?browserId=other&themeId=persee...	http/1.1
www.persee.fr/static/persee.png	http/1.1
www.persee.fr/persee-theme/images/skin/persee/picto/search-1.png	http/1.1
www.persee.fr/static/LOGO_CNRS_BLEU.png	http/1.1
/documents/10099/505733/ENS_2024-11/1a6cc584-1c59-4629-9c...	http/1.1
/documents/10099/505733/MENESR_logo_portail.png/e9ae2f42-...	http/1.1
/documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-714...	http/1.1
/documents/10099/1595712/Bandeau_RA2024.png/fc2d5a89-5408...	http/1.1
www.persee.fr/persee-theme/images/picto/more-news-1.png	http/1.1
www.persee.fr/persee-theme/images/picto/more-news-alt-1.png	http/1.1
/documents/10099/1367650/cls.png/391a0243-e2d2-4591-806c-...	http/1.1
/documents/10099/1367650/cbc.png/35c91685-2aae-4c3f-bb5c-...	http/1.1
/documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5...	http/1.1
/documents/10099/0/LinkedIn_white.png/4e038376-f4c3-4405-...	http/1.1
/documents/10099/0/X_logo_white.png/a20e15fc-1439-472b-94...	http/1.1
/documents/10099/0/Bluesky_White.png/b483ef21-dbfc-4825-b...	http/1.1
www.persee.fr/persee-theme/images/skin/persee/picto/back2top-3.png	http/1.1
/persee-theme/js/main.js?browserId=other&minifierType=js&...	http/1.1
/combo/?browserId=other&minifierType=&languageId=fr_FR&b=...	http/1.1
www.persee.fr/persee-theme/images/onglet.png	http/1.1
www.persee.fr/persee-theme/images/trame.png	http/1.1
/documents/10099/1609937/bandeau_versa/fe5e99f9-73fb-4b11...	http/1.1
www.persee.fr/persee-theme/images/skin/persee/picto/bullet-full-3.png	http/1.1
www.persee.fr/persee-theme/css/fonts/ens/BebasNeueBold-webfont.woff2	http/1.1
/persee-search-portlet/webjars/font-awesome/7.0.0/webfont...	http/1.1
www.persee.fr/persee-theme/css/fonts/ens/BebasNeueRegular-webfont.woff2	http/1.1
/combo/?browserId=other&minifierType=&languageId=fr_FR&b=...	http/1.1
/combo/?browserId=other&minifierType=&languageId=fr_FR&b=...	http/1.1
/html/js/liferay/available_languages.jsp?browserId=other&...	http/1.1
/combo/?browserId=other&minifierType=&languageId=fr_FR&b=...	http/1.1
www.persee.fr/favicon.ico	http/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

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
/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_...	1.4 MiB	2.2 s
/persee-theme/css/main.css?browserId=other&themeId=persee...	362.2 KiB	1.3 s
/html/portlet/journal/js/main.js?browserId=other&minifier...	52.9 KiB	483 ms
/html/portlet/journal/js/navigation.js?browserId=other&mi...	14.4 KiB	203 ms
/html/portlet/journal/css/main.css?browserId=other&themeI...	21.6 KiB	323 ms
/persee-search-portlet/webjars/font-awesome/7.0.0/css/fon...	56.4 KiB	523 ms
/persee-theme/css/aui.css?browserId=other&themeId=persee_...	209.6 KiB	1.0 s
/persee-search-portlet/webjars/font-awesome/7.0.0/css/bra...	15.3 KiB	243 ms
/html/css/main.css?browserId=other&themeId=persee_WAR_per...	143.5 KiB	843 ms
/html/portlet/asset_publisher/css/main.css?browserId=othe...	6.6 KiB	163 ms
/persee-search-portlet/webjars/font-awesome/7.0.0/css/sol...	1.2 KiB	123 ms

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.

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

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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: 180 ms 168.7 KiB

URL	Transfer Size	Est Savings
/persee-theme/css/main.css?browserId=other&themeId=persee...	362.2 KiB	92.9 KiB
/persee-theme/css/aui.css?browserId=other&themeId=persee_...	209.6 KiB	48.4 KiB
/html/css/main.css?browserId=other&themeId=persee_WAR_per...	143.5 KiB	24.4 KiB
/html/portlet/journal/css/main.css?browserId=other&themeI...	21.6 KiB	3.0 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: 730 ms 913.9 KiB

URL	Transfer Size	Est Savings
/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_...	1.4 MiB	894.4 KiB
/html/portlet/journal/js/main.js?browserId=other&minifier...	52.2 KiB	12.2 KiB
/combo/?browserId=other&minifierType=&languageId=fr_FR&b=...	23.2 KiB	4.4 KiB
/html/portlet/journal/js/navigation.js?browserId=other&mi...	13.8 KiB	2.8 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: 730 ms 783.5 KiB

URL	Transfer Size	Est Savings
/persee-theme/css/main.css?browserId=other&themeId=persee...	361.6 KiB	349.5 KiB
/persee-theme/css/aui.css?browserId=other&themeId=persee_...	209.0 KiB	200.6 KiB
/html/css/main.css?browserId=other&themeId=persee_WAR_per...	142.8 KiB	142.8 KiB
/persee-search-portlet/webjars/font-awesome/7.0.0/css/fon...	55.8 KiB	55.2 KiB
/html/portlet/journal/css/main.css?browserId=other&themeI...	20.9 KiB	20.9 KiB
/persee-search-portlet/webjars/font-awesome/7.0.0/css/bra...	14.7 KiB	14.4 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: 550 ms 706.9 KiB

URL	Transfer Size	Est Savings
/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_...	1.4 MiB	590.8 KiB
www.googletagmanager.com/gtag/js?id=G-4RE4X6PZER&cx=c&_slc=1	148.0 KiB	64.1 KiB
/html/portlet/journal/js/main.js?browserId=other&minifier...	52.2 KiB	52.0 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_...	1.4 MiB
/persee-theme/css/main.css?browserId=other&themeId=persee...	362.2 KiB
/documents/10099/1595712/Bandeau_RA2024.png/fc2d5a89-5408...	246.1 KiB
/persee-theme/css/aui.css?browserId=other&themeId=persee_...	209.6 KiB
/documents/10099/1609937/bandeau_versa/fe5e99f9-73fb-4b11...	158.9 KiB
www.googletagmanager.com/gtag/js?id=G-4RE4X6PZER&cx=c&_slc=1	148.4 KiB
/html/css/main.css?browserId=other&themeId=persee_WAR_per...	143.5 KiB
/persee-search-portlet/webjars/font-awesome/7.0.0/webfont...	99.3 KiB
/documents/10099/0/Bluesky_White.png/b483ef21-dbfc-4825-b...	85.6 KiB
/documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5...	60.5 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
persee.fr `header#navi > section#site-title > a.logo > img`	www.persee.fr/static/persee.png
div.content > p > a > img `div.content > p > a > img`	/documents/10099/1367650/cls.png/391a0243-e2d2-4591-806c-...
div.content > p > a > img `div.content > p > a > img`	/documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5...
div.persee_content > div.content > a > img `div.persee_content > div.content > a > img`	/documents/10099/1367650/cbc.png/35c91685-2aae-4c3f-bb5c-...
div.persee_news > p > a.picto > img.default-picto `div.persee_news > p > a.picto > img.default-picto`	www.persee.fr/persee-theme/images/picto/more-news-1.png

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

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Optimize viewport for mobile

●Max Potential First Input Delay 50 ms

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.3 s

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 10 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 300 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○Avoid long main-thread tasks

○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

ARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
FR EN `body.persee > header#sidebar`
Informations Au sujet de persee.fr Votre collection sur persee.fr Nous contac… `div.persee_content-nobox > div.persee_content > div.content > footer#footer`

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
Portail Persée `body.persee > header#persee-headbar > a.a_css`
alités `div.portlet-body > div.persee_news > h3 > span.perseePrimary`
en chiffres `div.portlet-body > div#doc-count > h4.title > span.emphasis`
nous ? `div.persee_content-nobox > div.persee_content > h4.title > span.perseePrimary`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
info.persee.fr `div.persee_content > div.content > p > a`
info.persee.fr `div.persee_content > div.content > p > a`
Publications de l'EHESS `div.persee_content > div.content > p > a`
Les Jeux olympiques `div.content > ul > li > a`
Les origines des jeux olympiques mythes et réalités `div.content > ul > li > a`
Les jeux olympiques dans l'Antiquité `div.content > ul > li > a`
Jeux Olympiques : du signal universel à la pluralité des images `div.content > ul > li > a`
Jeux et enjeux olympiques `div.content > ul > li > a`
Chiffres clés et premières analyses des Jeux olympiques et paralympiques `div.content > ul > li > a`
Persée `footer > footer#footer-small > section#copyright > a`

These are opportunities to improve the legibility of your content.

Navigation

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Persée en chiffres `div.portlet-borderless-container > div.portlet-body > div#doc-count > h4.title`

These are opportunities to improve keyboard navigation in your application.

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
div.persee_news > p > a.picto > img.default-picto `div.persee_news > p > a.picto > img.default-picto`

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
`div.content > header#header-banner > section#banner > a`
div.portlet-body > div.persee_news > p > a.picto `div.portlet-body > div.persee_news > p > a.picto`
div.persee_content-withpic > div.persee_content > h4.title > a `div.persee_content-withpic > div.persee_content > h4.title > a`
div.persee_content > div.content > p > a `div.persee_content > div.content > p > a`
div.persee_content-withpic > div.persee_content > h4.title > a `div.persee_content-withpic > div.persee_content > h4.title > a`
div.persee_content-withpic > div.persee_content > div.content > a `div.persee_content-withpic > div.persee_content > div.content > a`
div.persee_content-withpic > div.persee_content > h4.title > a `div.persee_content-withpic > div.persee_content > h4.title > a`
div.persee_content > div.content > p > a `div.persee_content > div.content > p > a`

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.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Au sujet de persee.fr `div.content > footer#footer > section#information > a`
Votre collection sur persee.fr `div.content > footer#footer > section#information > a`
Interopérabilité `div.content > footer#footer > section#resources > a`
Modèles documentaires `div.content > footer#footer > section#resources > a`
Statistiques de consultation `div.content > footer#footer > section#resources > a`
Kit logos `div.content > footer#footer > section#resources > a`
CGU `div.content > footer#footer > section#misc > a`
Mentions légales `div.content > footer#footer > section#misc > a`
Crédits `div.content > footer#footer > section#misc > a`
Politique d'archivage pérenne `div.content > footer#footer > section#misc > a`

These items highlight common accessibility best practices.

○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-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●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.

●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

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

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

○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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted 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

○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

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

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

○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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

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

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

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

○`[lang]` attributes have a valid value

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

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

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

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

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.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
div.persee_content-nobox > div.persee_content > div.content > img `div.persee_content-nobox > div.persee_content > div.content > img`	/documents/10099/1595712/Bandeau_RA2024.png/fc2d5a89-5408...	290 x 209 (1.39)	690 x 480 (1.44)
div.persee_content > div.content > p > img `div.persee_content > div.content > p > img`	/documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-714...	290 x 134 (2.16)	670 x 300 (2.23)

General

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... line 182, col 19

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
/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_...

●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

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

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

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div.persee_content-withpic > div.persee_content > h4.title > a `div.persee_content-withpic > div.persee_content > h4.title > a`
div.persee_content-withpic > div.persee_content > h4.title > a `div.persee_content-withpic > div.persee_content > h4.title > a`
div.persee_content-withpic > div.persee_content > h4.title > a `div.persee_content-withpic > div.persee_content > h4.title > a`

To appear in search results, crawlers need access to your app.

Content Best Practices

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
div.persee_news > p > a.picto > img.default-picto `div.persee_news > p > a.picto > img.default-picto`

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

●robots.txt is valid

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`