Lumni
May 01, 2015
Lumni est la nouvelle plateforme d’éducation en ligne de France Télévision. Lancée en Novembre 2019, elle connaît un essor sans précédent suite au confinement de l’ensemble des français, et notamment des élèves, à partir du 17 mars 2020 en raison de l’épidémie de Coronavirus. On peut voir sur les deux graphiques ci-dessous la corrélation entre l’intérêt pour le mot-clé “lumni” et “confinement” mesuré par recherche Google (Google Trends).
Analyse de performance
Voir le rapport desktop complet
- 110 ms, 0 KiB
- 140 ms, 0 KiB
Metrics
First Contentful Paint
0.7 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Speed Index
5.1 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint
4.2 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive
5.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time
3,520 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Cumulative Layout Shift
0.222
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Values are estimated and may vary. The performance score is calculated directly from these metrics.See calculator.
DiagnosticsMore information about the performance of your application. These numbers don't directly affect the Performance score.
Does not use passive listeners to improve scrolling performance
Consider marking your touch and wheel event listeners as `passive` to improve your page's scroll performance. Learn more.
URL | Location |
|---|---|
/college/troisieme (www.lumni.fr) | line: 0 |
Avoid document.write()
document.write()
For users on slow connections, external scripts dynamically injected via `document.write()` can delay page load by tens of seconds. Learn more.
URL | Location |
|---|---|
/college/troisieme (www.lumni.fr) | line: 104 |
…prod/utag.31.js?utv=ut4.46.202… (tags.tiqcdn.com) | line: 6 |
/601ac80e2039.js?lv=1 (w.usabilla.com) | line: 61 |
/kameleoon-iframe.html (www.lumni.fr) | line: 356 |
Minimize main-thread work
10.9 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn more
Category | Time Spent |
|---|---|
Script Evaluation | 6,691 ms |
Style & Layout | 1,772 ms |
Other | 1,617 ms |
Rendering | 311 ms |
Parse HTML & CSS | 230 ms |
Script Parsing & Compilation | 174 ms |
Garbage Collection | 79 ms |
Avoid an excessive DOM size
2,903 elements
A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn more.
Statistic | Element | Value |
|---|---|---|
Total DOM Elements | NaN | |
Maximum DOM Depth | <img class="" alt="Image : Soirée spéciale sur France 4 - Retour à l'école : quelle rentrée pour nos enfants ?" src="https://medias.lumni.fr/E8a2Os-rYrjYW8_2DcjsGZ9GtEY/250x130/filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f47bc2200a78e16d47d62c3" data-src="https://medias.lumni.fr/E8a2Os-rYrjYW8_2DcjsGZ9GtEY/250x130/filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f47bc2200a78e16d47d62c3" data-srcset="https://medias.lumni.fr/E8a2Os-rYrjYW8_2DcjsGZ9GtEY/250x130/filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f47bc2200a78e16d47d62c3" srcset="https://medias.lumni.fr/E8a2Os-rYrjYW8_2DcjsGZ9GtEY/250x130/filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f47bc2200a78e16d47d62c3"> | 19 |
Maximum Child Elements | <div class="slick-track"> | 22 |
Reduce JavaScript execution time
6.6 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn more.
URL | Total CPU Time | Script Evaluation | Script Parse |
|---|---|---|---|
/app.js?20200901-090948 (www.lumni.fr) | 6,452 ms | 5,233 ms | 6 ms |
/college/troisieme (www.lumni.fr) | 1,950 ms | 607 ms | 39 ms |
Unattributable | 1,163 ms | 37 ms | 0 ms |
…prod/utag.31.js?utv=ut4.46.202… (tags.tiqcdn.com) | 169 ms | 84 ms | 15 ms |
/601ac80e2039.js?lv=1 (w.usabilla.com) | 143 ms | 63 ms | 12 ms |
chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/include.preload.js | 136 ms | 74 ms | 0 ms |
/en_US/sdk.js?hash=bdeeda0…&ua=modern_es6 (connect.facebook.net) | 101 ms | 67 ms | 5 ms |
/uxa/51c51eac038f1.js (t.contentsquare.net) | 95 ms | 85 ms | 3 ms |
chrome-extension://gppongmhjkpfnbhagpmjfkannfbllamg/js/content.js | 79 ms | 45 ms | 2 ms |
/kameleoon.js (3cnha2b04n.kameleoon.eu) | 76 ms | 48 ms | 8 ms |
…prod/utag.js (tags.tiqcdn.com) | 75 ms | 70 ms | 3 ms |
/boomerang/UHZYR-YELMY-LU9MR-ZZLHV-TD6VW (s.go-mpulse.net) | 70 ms | 57 ms | 6 ms |
chrome-extension://apdaagmhepellbjjbnaljaocodjjjjfd/highlightjs/highlight.pack.js | 53 ms | 36 ms | 6 ms |
Serve static assets with an efficient cache policy
58 resources found
A long cache lifetime can speed up repeat visits to your page. Learn more.
Avoid chaining critical requests
5 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load. Learn more.
Maximum critical path latency: 10,720 ms
Initial Navigation
/college/troisieme
(www.lumni.fr)
/index.css?20200901-090948
- 20 ms, 29.01 KiB
(www.lumni.fr)
/app.js?20200901-090948
- 30 ms, 112.89 KiB
(www.lumni.fr)
/dataLayer.js?20200901-090948
- 20 ms, 5.89 KiB
(www.lumni.fr)
…www.lumni.fr/eca119ab-28d4-4b32-bf48-b67391869ec2
()
…www.lumni.fr/7ac52261-1310-4251-a633-8390ec144daf
()
Keep request counts low and transfer sizes small
83 requests • 1,099 KB
To set budgets for the quantity and size of page resources, add a budget.json file. Learn more.
Resource Type | Requests | Transfer Size |
|---|---|---|
Total | 83 | 1,098.9 KiB |
Script | 25 | 567.5 KiB |
Image | 51 | 416.1 KiB |
Document | 2 | 46 KiB |
Font | 3 | 40 KiB |
Stylesheet | 1 | 29 KiB |
Other | 1 | 0.3 KiB |
Media | 0 | 0 KiB |
Third-party | 31 | 450.1 KiB |
Largest Contentful Paint element
1 element found
This is the element that was identified as the Largest Contentful Paint. Learn More
Element |
|---|
Ma vie de profil : Bilal Hassani <img src="data:image/jpeg;base64,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" alt="Ma vie de profil : Bilal Hassani"> |
Avoid large layout shifts
5 elements found
These DOM elements contribute most to the CLS of the page.
Element |
|---|
ACTUALITÉ de la semaine pour la Troisième
Précédent
Article
Soirée spéciale s… <div class="wrapper no-background "> |
ENSEIGNEMENT
ÉDUCATEURS & MÉDIATEURS <div class="metanav-link"> |
ACTUALITÉ de la semaine pour la Troisième <h2> |
Logo Lumni <a href="https://www.lumni.fr" title="Lumni"> |
Ouvrir la newsletters <div class="metanav-connect"> |
Passed audits
(20)
Passed audits
(20)
Eliminate render-blocking resources
Potential savings of 0 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn more.
URL | Transfer Size | Potential Savings |
|---|---|---|
/index.css?20200901-090948 (www.lumni.fr) | 29 KiB | 80 ms |
Properly size images
Potential savings of 38 KB
Serve images that are appropriately-sized to save cellular data and improve load time. Learn more.
URL | Resource Size | Potential Savings | |
|---|---|---|---|
…filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f0f2e5… (medias.lumni.fr) | 27.6 KiB | 11.7 KiB | |
…filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5e81cd0… (medias.lumni.fr) | 21.8 KiB | 9.2 KiB | |
…filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f4386a… (medias.lumni.fr) | 17 KiB | 7.2 KiB | |
…filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f2812d… (medias.lumni.fr) | 13.9 KiB | 5.9 KiB | |
…filters:focal(0x0:0x0):quality(80):max_bytes(120000)/5f47bc2… (medias.lumni.fr) | 13.3 KiB | 4.3 KiB |
Defer offscreen images
Potential savings of 114 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. Learn more.
URL | Resource Size | Potential Savings | |
|---|---|---|---|
…filters:focal(602x167:601x166):quality(80):max_bytes(120000)/5… (medias.lumni.fr) | 85.3 KiB | 85.3 KiB | |
 | …icons/icon-lycee.svg?20200901-090948 (www.lumni.fr) | 8 KiB | 8 KiB |
 | …icons/icon-primaire.svg?20200901-090948 (www.lumni.fr) | 7.3 KiB | 7.3 KiB |
 | …icons/icon-college.svg?20200901-090948 (www.lumni.fr) | 4.9 KiB | 4.9 KiB |
 | …icons/search-menu.svg?20200901-090948 (www.lumni.fr) | 3.2 KiB | 3.2 KiB |
 | …icons/logo-b.svg?20200901-090948 (www.lumni.fr) | 2.6 KiB | 2.6 KiB |
 | …icons/search-mobile.svg?20200901-090948 (www.lumni.fr) | 2.5 KiB | 2.5 KiB |
Minify CSS
Minifying CSS files can reduce network payload sizes. Learn more.
Minify JavaScript
Minifying JavaScript files can reduce payload sizes and script parse time. Learn more.
Remove unused CSS
Potential savings of 25 KB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity. Learn more.
URL | Transfer Size | Potential Savings |
|---|---|---|
/index.css?20200901-090948 (www.lumni.fr) | 29 KiB | 25.1 KiB |
Remove unused JavaScript
Potential savings of 270 KB
Remove unused JavaScript to reduce bytes consumed by network activity. Learn more.
URL | Transfer Size | Potential Savings |
|---|---|---|
/boomerang/UHZYR-YELMY-LU9MR-ZZLHV-TD6VW (s.go-mpulse.net) | 101.2 KiB | 67 KiB |
/app.js?20200901-090948 (www.lumni.fr) | 112.9 KiB | 53.2 KiB |
/en_US/sdk.js?hash=bdeeda0…&ua=modern_es6 (connect.facebook.net) | 61 KiB | 41.4 KiB |
/uxa/51c51eac038f1.js (t.contentsquare.net) | 81.6 KiB | 35.9 KiB |
/kameleoon.js (3cnha2b04n.kameleoon.eu) | 83.2 KiB | 25.3 KiB |
/smarttag.js (tag.aticdn.net) | 42.3 KiB | 20.7 KiB |
/nr-spa-1177.min.js (js-agent.newrelic.com) | 13.9 KiB | 9 KiB |
/601ac80e2039.js?lv=1 (w.usabilla.com) | 10.7 KiB | 6.4 KiB |
/pagead/conversion_async.js (www.googleadservices.com) | 11.1 KiB | 4.3 KiB |
…prod/utag.32.js?utv=ut4.46.201… (tags.tiqcdn.com) | 6.2 KiB | 3.7 KiB |
…prod/utag.js (tags.tiqcdn.com) | 16.5 KiB | 3.2 KiB |
Efficiently encode images
Optimized images load faster and consume less cellular data. Learn more.
Serve images in next-gen formats
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more.
Enable text compression
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. Learn more.
Preconnect to required origins
Warnings: More than 2 preconnect links were found. Preconnect links should be used sparingly and only to the most important origins.
Consider adding `preconnect` or `dns-prefetch` resource hints to establish early connections to important third-party origins. Learn more.
Initial server response time was short
Root document took 20 ms
Keep the server response time for the main document short because all other requests depend on it. Learn more.
Avoid multiple page redirects
Redirects introduce additional delays before the page can be loaded. Learn more.
Preload key requests
Consider using `<link rel=preload>` to prioritize fetching resources that are currently requested later in page load. Learn more.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. Consider using MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF to save network bytes. Learn more
Avoids enormous network payloads
Total size was 1,099 KB
Large network payloads cost users real money and are highly correlated with long load times. Learn more.
URL | Transfer Size |
|---|---|
/app.js?20200901-090948 (www.lumni.fr) | 112.9 KiB |
/boomerang/UHZYR-YELMY-LU9MR-ZZLHV-TD6VW (s.go-mpulse.net) | 101.2 KiB |
…filters:focal(602x167:601x166):quality(80):max_bytes(120000)/5… (medias.lumni.fr) | 85.7 KiB |
/kameleoon.js (3cnha2b04n.kameleoon.eu) | 83.2 KiB |
/uxa/51c51eac038f1.js (t.contentsquare.net) | 81.6 KiB |
…filters:focal(568x229:567x228):quality(80):max_bytes(120000)/5… (medias.lumni.fr) | 66.1 KiB |
/en_US/sdk.js?hash=bdeeda0…&ua=modern_es6 (connect.facebook.net) | 61 KiB |
/smarttag.js (tag.aticdn.net) | 42.3 KiB |
/college/troisieme (www.lumni.fr) | 40.8 KiB |
…filters:focal(755x229:754x228):quality(80):max_bytes(120000)/5… (medias.lumni.fr) | 33.1 KiB |
User Timing marks and measures
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences. Learn more.
All text remains visible during webfont loads
Leverage the font-display CSS feature to ensure text is user-visible while webfonts are loading. Learn more.
Minimize third-party usage
Third-party code blocked the main thread for 30 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. Learn more.
Third-Party | Transfer Size | Main-Thread Blocking Time |
|---|---|---|
ContentSquare | 82 KiB | 31 ms |
| mPulse | 102 KiB | 0 ms |
63 KiB | 0 ms | |
| Tealium | 36 KiB | 0 ms |
| New Relic | 14 KiB | 0 ms |
| Google/Doubleclick Ads | 12 KiB | 0 ms |
| Usabilla | 11 KiB | 0 ms |
| Outbrain | 3 KiB | 0 ms |
| Other Google APIs/SDKs | 0 KiB | 0 ms |
Uses HTTP/2 for its own resources
HTTP/2 offers many benefits over HTTP/1.1, including binary headers, multiplexing, and server push. Learn more.
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged.
ContrastThese are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Low-contrast text is difficult or impossible for many users to read. Learn more.
Failing Elements |
|---|
Troisième <p>Troisième</p> |
Accueil <p>
Accueil
</p> |
NavigationThese are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
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.
Failing Elements |
|---|
Les clés de la République <h3>Les clés de la République</h3> |
Names and labelsThese 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.
Form elements do not have associated labels
Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more.
Failing Elements |
|---|
input <input type="text" id="resource_query" name="query" class="search-bar input-search search-header-primary input-search-hpp" placeholder="Rechercher une vidéo, un sujet, un thème..." autocomplete="off"> |
Links do not have a discernible name
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 more.
Failing Elements |
|---|
img <a class="button-search" href="/recherche?establishment=college&schoolLevel=troisieme"><img src="/images/icons/search-menu.svg?20200901-090948" alt=""></a> |
img <a href="#"><img class="lumni-footer" src="/images/icons/logo-b.svg?20200901-090948" alt=""></a> |
Tables and listsThese are opportunities to to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Lists do not contain only <li> elements and script supporting elements (<script> and <template>).
<li> elements and script supporting elements (<script> and <template>).
Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more.
Failing Elements |
|---|
Accueil
Emissions Lumni
Actualité
Brevet 2020
Histoire
Maths
Français
Gé… <ul class="thematic-level sticky"> |
List items (<li>) are not contained within <ul> or <ol> parent elements.
<li>) are not contained within <ul> or <ol> parent elements.
Screen readers require list items (`<li>`) to be contained within a parent `<ul>` or `<ol>` to be announced properly. Learn more.
Failing Elements |
|---|
Accueil <li><a href="/college/troisieme" title="Accueil" class="select-matiere"><div><img src="/images/icons/accueil.svg?20200901-090948" alt=""></div><p>
Accueil
</p></a></li> |
Emissions Lumni <li><a href="/college/troisieme/emissions-lumni" title="Emissions Lumni" class=""><div><img src="/images/icons/emissions-lumni.svg?20200901-090948" alt=""></div><p>
Emissions Lumni
</p></a></li> |
Actualité <li><a href="/college/troisieme/actualite" title="Actualité" class=""><div><img src="/images/icons/actualite.svg?20200901-090948" alt=""></div><p>
Actualité
</p></a></li> |
Brevet 2020 <li><a href="/college/troisieme/brevet" title="Brevet 2020" class=""><div><img src="/images/icons/brevet.svg?20200901-090948" alt=""></div><p>
Brevet 2020
</p></a></li> |
Histoire <li><a href="/college/troisieme/histoire" title="Histoire" class=""><div><img src="/images/icons/histoire.svg?20200901-090948" alt=""></div><p>
Histoire
</p></a></li> |
Maths <li><a href="/college/troisieme/mathematiques" title="Maths" class=""><div><img src="/images/icons/mathematiques.svg?20200901-090948" alt=""></div><p>
Maths
</p></a></li> |
Français <li><a href="/college/troisieme/francais" title="Français" class=""><div><img src="/images/icons/francais.svg?20200901-090948" alt=""></div><p>
Français
</p></a></li> |
Géographie <li><a href="/college/troisieme/geographie" title="Géographie" class=""><div><img src="/images/icons/geographie.svg?20200901-090948" alt=""></div><p>
Géographie
</p></a></li> |
SVT <li><a href="/college/troisieme/sciences-de-la-vie-et-de-la-terre" title="SVT" class=""><div><img src="/images/icons/sciences-de-la-vie-et-de-la-terre.svg?20200901-090948" alt=""></div><p>
SVT
</p></a></li> |
Physique-chimie <li><a href="/college/troisieme/physique-chimie" title="Physique-chimie" class=""><div><img src="/images/icons/physique-chimie.svg?20200901-090948" alt=""></div><p>
Physique-chimie
</p></a></li> |
Education aux médias et à l'information <li> |
Techno <li><a href="/college/troisieme/technologie" title="Techno" class=""><div><img src="/images/icons/technologie.svg?20200901-090948" alt=""></div><p>
Techno
</p></a></li> |
Arts et culture <li><a href="/college/troisieme/arts" title="Arts et culture" class=""><div><img src="/images/icons/arts.svg?20200901-090948" alt=""></div><p>
Arts et culture
</p></a></li> |
Enseignement moral et civique <li> |
Langues vivantes <li><a href="/college/troisieme/langues-vivantes" title="Langues vivantes" class=""><div><img src="/images/icons/langues-vivantes.svg?20200901-090948" alt=""></div><p>
Langues vivantes
</p></a></li> |
Sport <li><a href="/college/troisieme/education-physique-et-sportive" title="Sport" class=""><div><img src="/images/icons/education-physique-et-sportive.svg?20200901-090948" alt=""></div><p>
Sport
</p></a></li> |
Additional items to manually check
(10)
These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Additional items to manually check
(10)
These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
The page has a logical tab order
Tabbing through the page follows the visual layout. Users cannot focus elements that are offscreen. Learn more.
Interactive controls are keyboard focusable
Custom interactive controls are keyboard focusable and display a focus indicator. Learn more.
Interactive elements indicate their purpose and state
Interactive elements, such as links and buttons, should indicate their state and be distinguishable from non-interactive elements. Learn more.
The user's focus is directed to new content added to the page
If new content, such as a dialog, is added to the page, the user's focus is directed to it. Learn more.
User focus is not accidentally trapped in a region
A user can tab into and out of any control or region without accidentally trapping their focus. Learn more.
Custom controls have associated labels
Custom interactive controls have associated labels, provided by aria-label or aria-labelledby. Learn more.
Custom controls have ARIA roles
Custom interactive controls have appropriate ARIA roles. Learn more.
Visual order on the page follows DOM order
DOM order matches the visual order, improving navigation for assistive technology. Learn more.
Offscreen content is hidden from assistive technology
Offscreen content is hidden with display: none or aria-hidden=true. Learn more.
HTML5 landmark elements are used to improve navigation
Landmark elements (<main>, <nav>, etc.) are used to improve the keyboard navigation of the page for assistive technology. Learn more.
Passed audits
(20)
Passed audits
(20)
[aria-*] attributes match their roles
[aria-*] attributes match their roles
Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn more.
[aria-hidden="true"] is not present on the document <body>
[aria-hidden="true"] is not present on the document <body>
Assistive technologies, like screen readers, work inconsistently when `aria-hidden="true"` is set on the document `<body>`. Learn more.
[aria-hidden="true"] elements do not contain focusable descendents
[aria-hidden="true"] elements do not contain focusable descendents
Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn more.
[role]s have all required [aria-*] attributes
[role]s have all required [aria-*] attributes
Some ARIA roles have required attributes that describe the state of the element to screen readers. Learn more.
Elements with an ARIA [role] that require children to contain a specific [role] have all required children.
[role] that require children to contain a specific [role] have all required children.
Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more.
[role]s are contained by their required parent element
[role]s are contained by their required parent element
Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more.
[role] values are valid
[role] values are valid
ARIA roles must have valid values in order to perform their intended accessibility functions. Learn more.
[aria-*] attributes have valid values
[aria-*] attributes have valid values
Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values. Learn more.
[aria-*] attributes are valid and not misspelled
[aria-*] attributes are valid and not misspelled
Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid names. Learn more.
Buttons have an accessible name
When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn more.
The page contains a heading, skip link, or landmark region
Adding ways to bypass repetitive content lets keyboard users navigate the page more efficiently. Learn more.
Document has a <title> element
<title> element
The title gives screen reader users an overview of the page, and search engine users rely on it heavily to determine if a page is relevant to their search. Learn more.
[id] attributes on active, focusable elements are unique
[id] attributes on active, focusable elements are unique
All focusable elements must have a unique `id` to ensure that they're visible to assistive technologies. Learn more.
ARIA IDs are unique
The value of an ARIA ID must be unique to prevent other instances from being overlooked by assistive technologies. Learn more.
<frame> or <iframe> elements have a title
<frame> or <iframe> elements have a title
Screen reader users rely on frame titles to describe the contents of frames. Learn more.
<html> element has a [lang] attribute
<html> element has a [lang] attribute
If a page doesn't specify a lang attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more.
<html> element has a valid value for its [lang] attribute
<html> element has a valid value for its [lang] attribute
Specifying a valid BCP 47 language helps screen readers announce text properly. Learn more.
Image elements have [alt] attributes
[alt] attributes
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more.
[user-scalable="no"] is not used in the <meta name="viewport"> element and the [maximum-scale] attribute is not less than 5.
[user-scalable="no"] is not used in the <meta name="viewport"> element and the [maximum-scale] attribute is not less than 5.
Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more.
No element has a [tabindex] value greater than 0
[tabindex] value greater than 0
A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more.
Not applicable
(15)
Not applicable
(15)
[accesskey] values are unique
[accesskey] values are unique
Access keys let users quickly focus a part of the page. For proper navigation, each access key must be unique. Learn more.
ARIA input fields have accessible names
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.
ARIA toggle fields have accessible names
When a toggle 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.
<dl>'s contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.
<dl>'s contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.
When definition lists are not properly marked up, screen readers may produce confusing or inaccurate output. Learn more.
Definition list items are wrapped in <dl> elements
<dl> elements
Definition list items (`<dt>` and `<dd>`) must be wrapped in a parent `<dl>` element to ensure that screen readers can properly announce them. Learn more.
No form fields have multiple labels
Form fields with multiple labels can be confusingly announced by assistive technologies like screen readers which use either the first, the last, or all of the labels. Learn more.
<input type="image"> elements have [alt] text
<input type="image"> elements have [alt] text
When an image is being used as an `<input>` button, providing alternative text can help screen reader users understand the purpose of the button. Learn more.
Presentational <table> elements avoid using <th>, <caption> or the [summary] attribute.
<table> elements avoid using <th>, <caption> or the [summary] attribute.
A table being used for layout purposes should not include data elements, such as the th or caption elements or the summary attribute, because this can create a confusing experience for screen reader users. Learn more.
The document does not use <meta http-equiv="refresh">
<meta http-equiv="refresh">
Users do not expect a page to refresh automatically, and doing so will move focus back to the top of the page. This may create a frustrating or confusing experience. Learn more.
<object> elements have [alt] text
<object> elements have [alt] text
Screen readers cannot translate non-text content. Adding alt text to `<object>` elements helps screen readers convey meaning to users. Learn more.
Cells in a <table> element that use the [headers] attribute refer to table cells within the same table.
<table> element that use the [headers] attribute refer to table cells within the same table.
Screen readers have features to make navigating tables easier. Ensuring `<td>` cells using the `[headers]` attribute only refer to other cells in the same table may improve the experience for screen reader users. Learn more.
<th> elements and elements with [role="columnheader"/"rowheader"] have data cells they describe.
<th> elements and elements with [role="columnheader"/"rowheader"] have data cells they describe.
Screen readers have features to make navigating tables easier. Ensuring table headers always refer to some set of cells may improve the experience for screen reader users. Learn more.
[lang] attributes have a valid value
[lang] attributes have a valid value
Specifying a valid BCP 47 language on elements helps ensure that text is pronounced correctly by a screen reader. Learn more.
<video> elements contain a <track> element with [kind="captions"]
<video> elements contain a <track> element with [kind="captions"]
When a video provides a caption it is easier for deaf and hearing impaired users to access its information. Learn more.
<video> elements contain a <track> element with [kind="description"]
<video> elements contain a <track> element with [kind="description"]
Audio descriptions provide relevant information for videos that dialogue cannot, such as facial expressions and scenes. Learn more.
Trust and Safety
Links to cross-origin destinations are unsafe
Add `rel="noopener"` or `rel="noreferrer"` to any external links to improve performance and prevent security vulnerabilities. Learn more.
Failing Anchors |
|---|
icone facebook <a href="https://www.facebook.com/Lumnifr" target="_blank" title="Page Facebook LumniFR"> |
icone twitter <a href="https://twitter.com/LumniFR" target="_blank" title="Page Twitter LumniFR"> |
icone instagram <a href="https://www.instagram.com/lumnifr" target="_blank" title="Page Instagram LumniFR"> |
icone youtube <a href="https://m.youtube.com/user/francetveducation" target="_blank" title="Page Youtube LumniFR"> |
General
Browser errors were logged to the console
Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more
URL | Description |
|---|---|
/en_US/fbevents.js (connect.facebook.net) | Failed to load resource: net::ERR_BLOCKED_BY_CLIENT |
/en_US/fbevents.js (connect.facebook.net) | Failed to load resource: net::ERR_BLOCKED_BY_CLIENT |
/1/048e346e0d?a=… (bam.nr-data.net) | Failed to load resource: net::ERR_BLOCKED_BY_CLIENT |
/1/048e346e0d?a=… (bam.nr-data.net) | Failed to load resource: net::ERR_BLOCKED_BY_CLIENT |
chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js | ReferenceError: browser is not defined
at onScriptLoad (chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:172:3)
at chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:183:2 |
chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js | ReferenceError: browser is not defined
at onScriptLoad (chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:172:3)
at chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:183:2 |
chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js | ReferenceError: browser is not defined
at onScriptLoad (chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:172:3)
at chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:183:2 |
chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js | ReferenceError: browser is not defined
at onScriptLoad (chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:172:3)
at chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/adblock-onpage-icon-cs.js:183:2 |
/601ac80e2039.js?lv=1 (w.usabilla.com) | Refused to set the document's base URI to 'https://d6tizftlrpuof.cloudfront.net/live/' because it violates the following Content Security Policy directive: "base-uri https://www.lumni.fr". |
/601ac80e2039.js?lv=1 (w.usabilla.com) | Refused to set the document's base URI to 'https://d6tizftlrpuof.cloudfront.net/live/' because it violates the following Content Security Policy directive: "base-uri https://www.lumni.fr". |
Passed audits
(12)
Passed audits
(12)
Uses HTTPS
All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being servedover HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more.
Avoids requesting the geolocation permission on page load
Users are mistrustful of or confused by sites that request their location without context. Consider tying the request to a user action instead. Learn more.
Avoids requesting the notification permission on page load
Users are mistrustful of or confused by sites that request to send notifications without context. Consider tying the request to user gestures instead. Learn more.
Avoids front-end JavaScript libraries with known security vulnerabilities
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers. Learn more.
Allows users to paste into password fields
Preventing password pasting undermines good security policy. Learn more.
Displays images with correct aspect ratio
Image display dimensions should match natural aspect ratio. Learn more.
Displays images with appropriate size
Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn more.
Page has the HTML doctype
Specifying a doctype prevents the browser from switching to quirks-mode. Learn more.
Properly defines charset
A character encoding declaration is required. It can be done with a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header. Learn more.
Avoids Application Cache
Application Cache is deprecated. Learn more.
Detected JavaScript libraries
All front-end JavaScript libraries detected on the page. Learn more.
Name | Version |
|---|---|
boomerang.js | 1.632.0 |
Avoids deprecated APIs
Deprecated APIs will eventually be removed from the browser. Learn more.
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more.
Additional items to manually check
(1)
Run these additional validators on your site to check additional SEO best practices.
Additional items to manually check
(1)
Run these additional validators on your site to check additional SEO best practices.
Structured data is valid
Run the Structured Data Testing Tool and the Structured Data Linter to validate structured data. Learn more.
Passed audits
(10)
Passed audits
(10)
Has a <meta name="viewport"> tag with width or initial-scale
<meta name="viewport"> tag with width or initial-scale
Add a `<meta name="viewport">` tag to optimize your app for mobile screens. Learn more.
Document has a <title> element
<title> element
The title gives screen reader users an overview of the page, and search engine users rely on it heavily to determine if a page is relevant to their search. Learn more.
Document has a meta description
Meta descriptions may be included in search results to concisely summarize page content. Learn more.
Page has successful HTTP status code
Pages with unsuccessful HTTP status codes may not be indexed properly. Learn more.
Links have descriptive text
Descriptive link text helps search engines understand your content. Learn more.
Page isn’t blocked from indexing
Search engines are unable to include your pages in search results if they don't have permission to crawl them. Learn more.
robots.txt is valid
If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more.
Image elements have [alt] attributes
[alt] attributes
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more.
Document has a valid hreflang
hreflang
hreflang links tell search engines what version of a page they should list in search results for a given language or region. Learn more.
Document avoids plugins
Search engines can't index plugin content, and many devices restrict plugins or don't support them. Learn more.
Not applicable
(3)
Not applicable
(3)
Document has a valid rel=canonical
rel=canonical
Canonical links suggest which URL to show in search results. Learn more.
Document uses legible font sizes
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px. Learn more.
Tap targets are sized appropriately
Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements. Learn more.
These checks validate the aspects of a Progressive Web App. Learn more.
Fast and reliable
Page load is not fast enough on mobile networksYour page loads too slowly and is not interactive within 10 seconds. Look at the opportunities and diagnostics in the "Performance" section to learn how to improve.
Interactive on simulated mobile network at 20.8 s
Your page loads too slowly and is not interactive within 10 seconds. Look at the opportunities and diagnostics in the "Performance" section to learn how to improve.
Interactive on simulated mobile network at 20.8 s
A fast page load over a cellular network ensures a good mobile user experience. Learn more.
Current page does not respond with a 200 when offline
If you're building a Progressive Web App, consider using a service worker so that your app can work offline. Learn more.
start_url does not respond with a 200 when offlineNo usable web app manifest found on page.
start_url does not respond with a 200 when offlineNo usable web app manifest found on page.
A service worker enables your web app to be reliable in unpredictable network conditions. Learn more.
Installable
Uses HTTPS
All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being servedover HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more.
Does not register a service worker that controls page and start_url
start_url
The service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. Learn more.
Web app manifest does not meet the installability requirementsFailures: No manifest was fetched.
Failures: No manifest was fetched.
Browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement. Learn more.
PWA Optimized
Redirects HTTP traffic to HTTPS
If you've already set up HTTPS, make sure that you redirect all HTTP traffic to HTTPS in order to enable secure web features for all your users. Learn more.
Is not configured for a custom splash screenFailures: No manifest was fetched.
Failures: No manifest was fetched.
A themed splash screen ensures a high-quality experience when users launch your app from their homescreens. Learn more.
Does not set a theme color for the address bar.Failures: No manifest was fetched,
No `<meta name="theme-color">` tag found.
Failures: No manifest was fetched,
No `<meta name="theme-color">` tag found.
The browser address bar can be themed to match your site. Learn more.
Content is sized correctly for the viewport
If the width of your app's content doesn't match the width of the viewport, your app might not be optimized for mobile screens. Learn more.
Has a <meta name="viewport"> tag with width or initial-scale
<meta name="viewport"> tag with width or initial-scale
Add a `<meta name="viewport">` tag to optimize your app for mobile screens. Learn more.
Contains some content when JavaScript is not available
Your app should display some content when JavaScript is disabled, even if it's just a warning to the user that JavaScript is required to use the app. Learn more.
Provides a valid apple-touch-icon
apple-touch-icon
For ideal appearance on iOS when users add a progressive web app to the home screen, define an `apple-touch-icon`. It must point to a non-transparent 192px (or 180px) square PNG. Learn More.
Manifest doesn't have a maskable iconNo manifest was fetched
No manifest was fetched
A maskable icon ensures that the image fills the entire shape without being letterboxed when installing the app on a device. Learn more.
Additional items to manually check
(3)
These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Additional items to manually check
(3)
These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Site works cross-browser
To reach the most number of users, sites should work across every major browser. Learn more.
Page transitions don't feel like they block on the network
Transitions should feel snappy as you tap around, even on a slow network. This experience is key to a user's perception of performance. Learn more.
Each page has a URL
Ensure individual pages are deep linkable via URL and that URLs are unique for the purpose of shareability on social media. Learn more.