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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.

42

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.

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:9.5e-05] map[node:map[boundingRect:map[bottom:53 height:36 left:333 right:402 top:17 width:69] lhId:page-7-UL nodeLabel:DE EN path:1,HTML,2,BODY,0,DIV,0,HEADER,5,DIV,2,NAV,0,UL selector:header > div.nav-mobile-menu > nav.nav-language-container > ul.nav-language snippet:<ul class="nav-language"> type:node] score:5.8e-05 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:307 height:195 left:-1162 right:-772 top:112 width:391] lhId:page-16-IMG nodeLabel:Das Bild zeigt etwa 20 Sportlerinnen und Sportler in einer Turnhalle, die Akrob… path:1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,7,ARTICLE,2,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,FIGURE,0,A,0,PICTURE,3,IMG selector:figure > a > picture > img snippet:<img src="https://www.uni-muenster.de/news/data/img/2026/03/15324-wguCOBOz-webML@2x.…" width="750" height="374" data-sizes="auto" alt="Das Bild zeigt etwa 20 Sportlerinnen und Sportler in einer Turnhalle, die …"> type:node]] map[cause:Web font extra:map[type:url value:https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-normal.woff]]] type:subitems]] map[node:map[boundingRect:map[bottom:53 height:36 left:333 right:402 top:17 width:69] lhId:page-7-UL nodeLabel:DE EN path:1,HTML,2,BODY,0,DIV,0,HEADER,5,DIV,2,NAV,0,UL selector:header > div.nav-mobile-menu > nav.nav-language-container > ul.nav-language snippet:<ul class="nav-language"> type:node] score:3.7e-05 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:919 height:391 left:9 right:399 top:528 width:391] lhId:page-0-IMG nodeLabel:Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München vor d… path:1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,10,ARTICLE,1,DIV,0,FIGURE,0,A,0,PICTURE,1,IMG selector:figure.teaserfigure > a > picture > img snippet:<img src="https://www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM…" width="570" height="570" data-sizes="auto" alt="Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München …"> type:node]] map[cause:Web font extra:map[type:url value:https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/wwu_symbol.woff]]] type:subitems]]]
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.8849360000000001] map[node:map[boundingRect:map[bottom:1273 height:773 left:7 right:401 top:500 width:395] lhId:page-13-ARTICLE nodeLabel:13. April 2026 © LMU München - Gerhard Gnauck Universität eröffnet Ausstellung … path:1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,10,ARTICLE selector:div#top > div.content > section#inhalt > article.module snippet:<article class="module extended secondary " style="clear: left;"> type:node] score:0.461528 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:919 height:391 left:9 right:399 top:528 width:391] lhId:page-0-IMG nodeLabel:Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München vor d… path:1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,10,ARTICLE,1,DIV,0,FIGURE,0,A,0,PICTURE,1,IMG selector:figure.teaserfigure > a > picture > img snippet:<img src="https://www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM…" width="570" height="570" data-sizes="auto" alt="Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München …"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1273 height:773 left:7 right:401 top:500 width:395] lhId:page-13-ARTICLE nodeLabel:13. April 2026 © LMU München - Gerhard Gnauck Universität eröffnet Ausstellung … path:1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,10,ARTICLE selector:div#top > div.content > section#inhalt > article.module snippet:<article class="module extended secondary " style="clear: left;"> type:node] score:0.420637 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:307 height:195 left:-1943 right:-1553 top:112 width:391] lhId:page-18-IMG nodeLabel:Das Bild zeigt klatschende Hände bei einem Konzert.<address>© stockadobe.com - … path:1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,7,ARTICLE,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,FIGURE,0,A,0,PICTURE,3,IMG selector:figure > a > picture > img snippet:<img src="https://www.uni-muenster.de/news/data/img/2026/03/15322-73uI2dpJ-webML@2x.…" width="750" height="375" data-sizes="auto" alt="Das Bild zeigt klatschende Hände bei einem Konzert.&lt;address&gt;© stockadobe.c…"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:80 height:65 left:10 right:252 top:15 width:242] lhId:page-8-A nodeLabel:Universität Münster path:1,HTML,2,BODY,0,DIV,0,HEADER,0,DIV,0,A selector:div#top > header > div#logos > a.wwulogo snippet:<a href="/de/" class="wwulogo svg"> type:node] score:0.002732 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:80 height:65 left:10 right:252 top:15 width:242] lhId:page-17-IMG nodeLabel:Universität Münster path:1,HTML,2,BODY,0,DIV,0,HEADER,0,DIV,0,A,0,IMG selector:header > div#logos > a.wwulogo > img#logo snippet:<img src="/imperia/md/images/allgemein/farbunabhaengig/unims.svg" width="357" height="96" alt="Universität Münster" id="logo" class="university-logo svg"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:53 height:36 left:333 right:402 top:17 width:69] lhId:page-7-UL nodeLabel:DE EN path:1,HTML,2,BODY,0,DIV,0,HEADER,5,DIV,2,NAV,0,UL selector:header > div.nav-mobile-menu > nav.nav-language-container > ul.nav-language snippet:<ul class="nav-language"> type:node] score:3.9e-05 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:919 height:391 left:9 right:399 top:528 width:391] lhId:page-0-IMG nodeLabel:Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München vor d… path:1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,10,ARTICLE,1,DIV,0,FIGURE,0,A,0,PICTURE,1,IMG selector:figure.teaserfigure > a > picture > img snippet:<img src="https://www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM…" width="570" height="570" data-sizes="auto" alt="Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München …"> type:node]] map[cause:Web font extra:map[type:url value:https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-bold.woff]]] type:subitems]]]

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.

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.

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
Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München vor d… figure.teaserfigure > a > picture > img
www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM@2x.jpg363.6 KiB287.6 KiB
Das Bild zeigt etwa 20 Sportlerinnen und Sportler in einer Turnhalle, die Akrob… figure > a > picture > img
www.uni-muenster.de/news/data/img/2026/03/15324-wguCOBOz-webML@2x.jpg210.8 KiB172.8 KiB
<address>© Bezirksregierung Münster</address> figure > a > picture > img
www.uni-muenster.de/news/data/img/2026/04/web-3AxRIK2X-webML@2x.jpg158.7 KiB120.7 KiB
Seit kurzem steht am MEET Batterieforschungszentrum ein neues Forschungsgerät: … figure > a > picture > img
www.uni-muenster.de/news/data/img/2026/04/15343-fKF2VXz3-webML@2x.jpg132.3 KiB94.3 KiB
Das Bild zeigt klatschende Hände bei einem Konzert.<address>© stockadobe.com - … figure > a > picture > img
www.uni-muenster.de/news/data/img/2026/03/15322-73uI2dpJ-webML@2x.jpeg117.5 KiB79.5 KiB
Pl 200923 3338 Mittel div.module-content > figure.teaserfigure > a > img
/imperia/md/images/zentral/weiterbildung/fittosize_730_36...81.0 KiB37.7 KiB
Studentenwerk Wohnheim Boeselagerstr _4_ div.module-content > figure.teaserfigure > a > img
/imperia/md/images/allgemein/2014/leben/fittosize_730_365...77.3 KiB34.0 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:2153.162 label:Time to first byte subpart:timeToFirstByte] map[duration:16.415 label:Resource load delay subpart:resourceLoadDelay] map[duration:1882.801 label:Resource load duration subpart:resourceLoadDuration] map[duration:47.851 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München vor d…
path: 1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,10,ARTICLE,1,DIV,0,FIGURE,0,A,0,PICTURE,1,IMG
selector: figure.teaserfigure > a > picture > img
snippet: <img src="https://www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM…" width="570" height="570" data-sizes="auto" alt="Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München …">

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-0-IMG
nodeLabel: Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München vor d…
path: 1,HTML,2,BODY,0,DIV,5,DIV,3,SECTION,10,ARTICLE,1,DIV,0,FIGURE,0,A,0,PICTURE,1,IMG
selector: figure.teaserfigure > a > picture > img
snippet: <img src="https://www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM…" width="570" height="570" data-sizes="auto" alt="Drei Menschen stehen im Gebäue der Ludwig-Maximilians-Universität München …">

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.

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.

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: 1.7 s

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
13. April 2026 © LMU München - Gerhard Gnauck Universität eröffnet Ausstellung … div#top > div.content > section#inhalt > article.module
0.462
13. April 2026 © LMU München - Gerhard Gnauck Universität eröffnet Ausstellung … div#top > div.content > section#inhalt > article.module
0.421
Universität Münster div#top > header > div#logos > a.wwulogo
0.003
DE EN header > div.nav-mobile-menu > nav.nav-language-container > ul.nav-language
0.000
DE EN header > div.nav-mobile-menu > nav.nav-language-container > ul.nav-language
0.000
DE EN header > div.nav-mobile-menu > nav.nav-language-container > ul.nav-language
0.000

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

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: 160 ms 20.2 KiB
URLTransfer SizeEst Savings
www.uni-muenster.de/wwu/css/main.css25.1 KiB20.2 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.3 KiB
URLTransfer SizeEst Savings
www.uni-muenster.de/wwu/js/main.js10.5 KiB2.3 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: 0.0 ms 65.5 KiB
URLTransfer SizeEst Savings
piwik.uni-muenster.de/piwik.js102.9 KiB65.5 KiB

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

Max Potential First Input Delay 70 ms
Optimize DOM size
Forced reflow
Optimize viewport for mobile
Minify CSS
Avoids enormous network payloads Total size was 1,497 KiB
JavaScript execution time 0.4 s
Minimizes main-thread work 1.9 s
Avoid long main-thread tasks 7 long tasks found
Image elements have explicit `width` and `height`
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 210 ms
Server Backend Latencies 910 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 210 ms
INP breakdown
User Timing marks and measures
Avoid non-composited animations
87

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.

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
© LMU München - Gerhard Gnauck div.module-content > figure.teaserfigure > figcaption > address
STUDIUM header.module > div.module-content > h2#anchor_1_74 > a
Studium an der Universität Münster div.content > section#inhalt > article.module > div.metainfo
© Uni MS - Peter Lessmann div.module-content > figure.teaserfigure > figcaption > address
Berufsbegleitend studieren an der Universität Münster div.module-content > header > h2 > a
Universität Münster Professional School div.module-content > ul.linkliste > li > a.ext
JurGrad div.module-content > ul.linkliste > li > a.ext
© Studierendenwerk Münster div.module-content > figure.teaserfigure > figcaption > address
Wohnen in Münster div.module-content > header > h2 > a
"Studierzimmer" in Münster div.module-content > ul.linkliste > li > a.ext
"Deine Couch für Erstis" div.module-content > ul.linkliste > li > a.ext
Studierendenwerk div.module-content > ul.linkliste > li > a.ext
Elektronische Wohnsitzanmeldung div.module-content > ul.linkliste > li > a.ext
Links div.content > section#inhalt > aside.module > h2.metainfo
Studienmöglichkeiten an der Universität Münster div.module-content > ul.linkliste > li > a.int
Bewerbung div.module-content > ul.linkliste > li > a.int
Professional School div.module-content > ul.linkliste > li > a.ext
Internationale Mobilität div.module-content > ul.linkliste > li > a.int
Organisation div.module-content > ul.linkliste > li > a.int
Hilfe und Beratung div.module-content > ul.linkliste > li > a.int
Studierendensekretariat div.module-content > ul.linkliste > li > a.int
Fristen und Termine div.module-content > ul.linkliste > li > a.int
Zentrale Studienberatung div.module-content > ul.linkliste > li > a.ext
Career Service div.module-content > ul.linkliste > li > a.ext
Karriereportal unikap.ms div.module-content > ul.linkliste > li > a.ext
Universitäts- und Landesbibliothek div.module-content > ul.linkliste > li > a.ext
Hochschulsport div.module-content > ul.linkliste > li > a.ext
Sprachen lernen div.module-content > ul.linkliste > li > a.ext
© Judith Kraft div.module-content > figure.teaserfigure > figcaption > address
DIE UNIVERSITÄT MÜNSTER section#inhalt > header.module > div.module-content > h2#anchor_1_76
© Uni MS Compliance Office div.module-content > figure.teaserfigure > figcaption > address
Compliance an der Universität Münster div.module-content > header > h2 > a
Code of Conduct div.module-content > ul.linkliste > li > a.int
Compliance Guide div.module-content > ul.linkliste > li > a.int
Interne Meldestelle div.module-content > ul.linkliste > li > a.ext
© Uni MS div.module-content > figure.teaserfigure > figcaption > address
Ulysseus an der Universität Münster div.module-content > header > h2 > a
European Universities initiative div.module-content > ul.linkliste > li > a.ext
© Uni MS - Peter Grewer div.module-content > figure.teaserfigure > figcaption > address
Karriere an der Universität Münster div.module-content > header > h2 > a
Aktuelle Stellenangebote div.module-content > ul.linkliste > li > a.int
nach oben div#top > footer > div.row > a.nav-slideup

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
News und Termine im Überblick section#inhalt > aside.module > div.module-content > h4

These are opportunities to improve keyboard navigation in your application.

Names and labels

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
header > div.nav-mobile-menu > nav.nav-mobile > a.nav-mobile-toggle header > div.nav-mobile-menu > nav.nav-mobile > a.nav-mobile-toggle
header > div.nav-mobile-menu > div.nav-search-mobile > a.nav-search-mobile-toggle header > div.nav-mobile-menu > div.nav-search-mobile > a.nav-search-mobile-toggle

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
Leichte Sprache aside.module > ul.linkliste > li > a.int
Personensuche aside.module > ul.linkliste > li > a.int
Uni A-Z aside.module > ul.linkliste > li > a.int
Lageplan aside.module > ul.linkliste > li > a.int
Fachbereiche aside.module > ul.linkliste > li > a.int
Uni-Bi­bli­o­thek aside.module > ul.linkliste > li > a.int
Vor­le­sungs­ver­zeich­nis aside.module > ul.linkliste > li > a.int
Stu­die­ren­den­se­kre­ta­ri­at aside.module > ul.linkliste > li > a.int
INDEX nav.nav-footer > ul > li.js > a
SITE MAP nav.nav-footer > ul > li.js > a
BARRIEREFREIHEIT nav.nav-footer > ul > li.js > 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-*]` attributes match their roles
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
`[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 use only permitted ARIA attributes
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
No element has a `[tabindex]` value greater than 0
`[lang]` attributes have a valid value
Skip links are focusable.
Document has a main landmark.
Deprecated ARIA roles were not used
Uses ARIA roles only on compatible elements
`[accesskey]` values are unique
`button`, `link`, and `menuitem` elements have accessible names
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 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
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
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.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
`<video>` elements contain a `<track>` element with `[kind="captions"]`
Tables have different content in the summary attribute and `<caption>`.
All heading elements contain content.
Image elements do not have `[alt]` attributes that are redundant text.
Identical links have the same purpose.
Elements with visible text labels have matching accessible names.
Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
`<td>` elements in a large `<table>` have one or more table headers.
100

Best Practices

Uses HTTPS
Avoids deprecated APIs
Avoids third-party cookies
Allows users to paste into input fields
Avoids requesting the geolocation permission on page load
Avoids requesting the notification permission on page load
Displays images with correct aspect ratio
Serves images with appropriate resolution
Page has the HTML doctype
Properly defines charset
No 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 clickjacking with XFO or CSP
Mitigate DOM-based XSS with Trusted Types
Detected JavaScript libraries
Page has valid source maps
Redirects HTTP traffic to HTTPS
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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