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· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

70

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:0.326256] map[node:map[boundingRect:map[bottom:3031 height:2296 left:90 right:1260 top:735 width:1170] lhId:page-33-DIV nodeLabel:Die Universität Göttingen ist eine international bedeutende Forschungsuniversit… path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV selector:div#scrollable-area > div#main > div.container-fluid > div#page-content snippet:<div id="page-content"> type:node] score:0.237209] map[node:map[boundingRect:map[bottom:1533 height:288 left:90 right:460 top:1245 width:370] lhId:page-25-P nodeLabel:Der Ökologe und Biodiversitätsforscher Dr. Gustavo B. Paterno von der Universit… path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV,1,SECTION,1,A,2,P selector:div#page-content > section.news > a.col-sm-4 > p snippet:<p> type:node] score:0.031417 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1180 height:257 left:90 right:460 top:923 width:370] lhId:page-38-IMG nodeLabel:Dr. Gustavo B. Paterno path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV,1,SECTION,1,A,0,IMG selector:div#page-content > section.news > a.col-sm-4 > img.img-responsive snippet:<img src="https://prins.uni-goettingen.de/files/bilder/pic_df44b9274b20260422150715.…" class="img-responsive" alt="Dr. Gustavo B. Paterno"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1492 height:264 left:490 right:860 top:1228 width:370] lhId:page-31-P nodeLabel:Jubiläum an der Universität Göttingen: Vor 25 Jahren startete die Universität a… path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV,1,SECTION,2,A,2,P selector:div#page-content > section.news > a.col-sm-4 > p snippet:<p> type:node] score:0.024646 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1180 height:257 left:490 right:860 top:923 width:370] lhId:page-0-IMG nodeLabel:div#page-content > section.news > a.col-sm-4 > img.img-responsive path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV,1,SECTION,2,A,0,IMG selector:div#page-content > section.news > a.col-sm-4 > img.img-responsive snippet:<img src="https://prins.uni-goettingen.de/files/bilder/pic_26a3230f6620260417102444.…" class="img-responsive" alt=""> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1492 height:264 left:890 right:1260 top:1228 width:370] lhId:page-29-P nodeLabel:Der Holzwissenschaftler Prof. Dr. Holger Militz von der Universität Göttingen e… path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV,1,SECTION,3,A,2,P selector:div#page-content > section.news > a.col-sm-4 > p snippet:<p> type:node] score:0.024639 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1180 height:257 left:890 right:1260 top:923 width:370] lhId:page-11-IMG nodeLabel:div#page-content > section.news > a.col-sm-4 > img.img-responsive path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV,1,SECTION,3,A,0,IMG selector:div#page-content > section.news > a.col-sm-4 > img.img-responsive snippet:<img src="https://prins.uni-goettingen.de/files/bilder/pic_dc12ec300720260421104624.…" class="img-responsive" alt=""> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:865 height:130 left:90 right:1260 top:735 width:1170] lhId:page-23-ARTICLE nodeLabel:Die Universität Göttingen ist eine international bedeutende Forschungsuniversit… path:1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,2,DIV,0,ARTICLE selector:div#main > div.container-fluid > div#page-content > article.col-sm-12 snippet:<article class="col-sm-12 lead-paragraph"> type:node] score:0.008345]]

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
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_26a3230f6620260417102444.jpg473.7 KiB458.2 KiB
Öffentliche Ringvorlesung: Lachen in Krisenzeiten Sommersemester 2026 div.carousel-inner > div.item > a > img
www.uni-goettingen.de/storage/pictures/180347.png463.8 KiB381.4 KiB
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_e5ae45dc6c20260416111252.jpg104.4 KiB88.9 KiB
Nature Positive Universities div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/5ae8aa86003bbb12f6c7c3be78135918.png78.6 KiB74.1 KiB
Komm auf neue Gedanken, geh ins Forum Wissen! div#page-content > div.banner > a.col-sm-4 > img.img-responsive
uni-goettingen.de/storage/pictures/161072.jpg84.1 KiB73.7 KiB
Diversity Re-Audit 2024 div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/161159.jpg68.7 KiB64.2 KiB
Charta der Vielfalt div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/45dab66f9d4749f550ae25453e18e0ea.jpg65.7 KiB61.2 KiB
Familie in der Hochschule div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/025d2c0f40c545b084d0c833cb1bfe5b.jpg65.4 KiB61.0 KiB
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_5293d0331120260417082705.jpg71.9 KiB56.4 KiB
Ein Banner mit folgenden Informationen: 11. Konferenz für studentische Forschun… div#page-content > div.banner > a.col-sm-4 > img.img-responsive
uni-goettingen.de/storage/pictures/177687.png56.5 KiB46.1 KiB
German U15 div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/ffcaeb3a090217fdd2a8a47f28c3f47c.jpg45.0 KiB40.6 KiB
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_dc12ec300720260421104624.jpg46.2 KiB34.0 KiB
The Guild div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/25cd9f69a6f57b421d56b46365c8a81e.jpg37.9 KiB33.4 KiB
Scholars at Risk div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/9e40a7dc74992ead660af0fe878adccc.jpg36.6 KiB32.1 KiB
Stoppt sexualisierte Belästigung und Gewalt div#page-content > div.banner > a.col-sm-4 > img.img-responsive
uni-goettingen.de/storage/pictures/164108.png40.8 KiB30.5 KiB
European University Association (EUA) div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/6b3b90e8ff52f8d46e3227a5ad4160e2.jpg33.9 KiB29.4 KiB
HeKKSaGOn div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/7f6f237ad3c95a405a3a14f3da4d0474.jpg32.2 KiB27.7 KiB
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_08e00e47a020260420095435.jpg27.7 KiB20.4 KiB
Initiative transparente Tierversuche div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/f34d872115b916a1703a9eb3708298c0.png19.4 KiB16.9 KiB
Deutschlandstipendium Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/ac733cb0b2575c4f3ad6b2da2935b6a5.png20.6 KiB16.1 KiB
ENLIGHT div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/167451.jpg19.0 KiB14.8 KiB
Weltoffene Hochschule Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/0b1b54ca9e89ef6c46b1275d57a4b797.png16.3 KiB12.7 KiB
Göttingen Campus Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/8343f97999fbfe69e90d22a1ec70a9f3.png10.6 KiB8.3 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-1-IMG
nodeLabel: Öffentliche Ringvorlesung: Lachen in Krisenzeiten Sommersemester 2026
path: 1,HTML,1,BODY,1,SECTION,0,DIV,12,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,2,DIV,3,DIV,0,A,0,IMG
selector: div.carousel-inner > div.item > a > img
snippet: <img src="https://www.uni-goettingen.de/storage/pictures/180347.png" alt="Öffentliche Ringvorlesung: Lachen in Krisenzeiten Sommersemester 2026" style="margin-bottom: 0px;">

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

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

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
Die Universität Göttingen ist eine international bedeutende Forschungsuniversit… div#scrollable-area > div#main > div.container-fluid > div#page-content
0.237
Der Ökologe und Biodiversitätsforscher Dr. Gustavo B. Paterno von der Universit… div#page-content > section.news > a.col-sm-4 > p
0.031
Jubiläum an der Universität Göttingen: Vor 25 Jahren startete die Universität a… div#page-content > section.news > a.col-sm-4 > p
0.025
Der Holzwissenschaftler Prof. Dr. Holger Militz von der Universität Göttingen e… div#page-content > section.news > a.col-sm-4 > p
0.025
Die Universität Göttingen ist eine international bedeutende Forschungsuniversit… div#main > div.container-fluid > div#page-content > article.col-sm-12
0.008

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 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: 50 ms 3.1 KiB
URLTransfer SizeEst Savings
uni-goettingen.de/js/jquery/jquery.offcanvas.js5.7 KiB3.1 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: 90 ms 35.9 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 20.1 KiB
URLTransfer SizeEst Savings
matomo.gwdg.de/matomo.js21.6 KiB20.1 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_26a3230f6620260417102444.jpg
Öffentliche Ringvorlesung: Lachen in Krisenzeiten Sommersemester 2026 div.carousel-inner > div.item > a > img
www.uni-goettingen.de/storage/pictures/180347.png
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_dc12ec300720260421104624.jpg
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_08e00e47a020260420095435.jpg
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_5293d0331120260417082705.jpg
div#page-content > section.news > a.col-sm-4 > img.img-responsive div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_e5ae45dc6c20260416111252.jpg
Ein Banner mit folgenden Informationen: 11. Konferenz für studentische Forschun… div#page-content > div.banner > a.col-sm-4 > img.img-responsive
uni-goettingen.de/storage/pictures/177687.png
Komm auf neue Gedanken, geh ins Forum Wissen! div#page-content > div.banner > a.col-sm-4 > img.img-responsive
uni-goettingen.de/storage/pictures/161072.jpg
Stoppt sexualisierte Belästigung und Gewalt div#page-content > div.banner > a.col-sm-4 > img.img-responsive
uni-goettingen.de/storage/pictures/164108.png
Nature Positive Universities div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/5ae8aa86003bbb12f6c7c3be78135918.png
Nature Positive Universities div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/5ae8aa86003bbb12f6c7c3be78135918.png
Initiative transparente Tierversuche div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/f34d872115b916a1703a9eb3708298c0.png
Initiative transparente Tierversuche div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/f34d872115b916a1703a9eb3708298c0.png
Scholars at Risk div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/9e40a7dc74992ead660af0fe878adccc.jpg
ENLIGHT div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/167451.jpg
German U15 div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/ffcaeb3a090217fdd2a8a47f28c3f47c.jpg
Charta der Vielfalt div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/45dab66f9d4749f550ae25453e18e0ea.jpg
Göttingen Campus Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/8343f97999fbfe69e90d22a1ec70a9f3.png
Deutschlandstipendium Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/ac733cb0b2575c4f3ad6b2da2935b6a5.png
Familie in der Hochschule div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/025d2c0f40c545b084d0c833cb1bfe5b.jpg
Weltoffene Hochschule Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/0b1b54ca9e89ef6c46b1275d57a4b797.png
Diversity Re-Audit 2024 div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/161159.jpg
European University Association (EUA) div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/6b3b90e8ff52f8d46e3227a5ad4160e2.jpg
The Guild div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/25cd9f69a6f57b421d56b46365c8a81e.jpg
HeKKSaGOn div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/7f6f237ad3c95a405a3a14f3da4d0474.jpg
Scholars at Risk div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/9e40a7dc74992ead660af0fe878adccc.jpg
ENLIGHT div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/167451.jpg
German U15 div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/ffcaeb3a090217fdd2a8a47f28c3f47c.jpg
Charta der Vielfalt div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/45dab66f9d4749f550ae25453e18e0ea.jpg
Göttingen Campus Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/8343f97999fbfe69e90d22a1ec70a9f3.png
Deutschlandstipendium Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/ac733cb0b2575c4f3ad6b2da2935b6a5.png
Familie in der Hochschule div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/025d2c0f40c545b084d0c833cb1bfe5b.jpg
Weltoffene Hochschule Logo div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/0b1b54ca9e89ef6c46b1275d57a4b797.png
Diversity Re-Audit 2024 div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/161159.jpg
European University Association (EUA) div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/6b3b90e8ff52f8d46e3227a5ad4160e2.jpg
The Guild div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/25cd9f69a6f57b421d56b46365c8a81e.jpg
HeKKSaGOn div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/7f6f237ad3c95a405a3a14f3da4d0474.jpg
Scholars at Risk div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/9e40a7dc74992ead660af0fe878adccc.jpg
ENLIGHT div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/167451.jpg
German U15 div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/ffcaeb3a090217fdd2a8a47f28c3f47c.jpg
Charta der Vielfalt div.slick-track > div.slide > a > img.img-responsive
uni-goettingen.de/storage/pictures/45dab66f9d4749f550ae25453e18e0ea.jpg
Dr. Gustavo B. Paterno div#page-content > section.news > a.col-sm-4 > img.img-responsive
prins.uni-goettingen.de/files/bilder/pic_df44b9274b20260422150715.jpg

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

●Document request latency
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Optimize viewport for mobile
●Max Potential First Input Delay 20 ms
●Minify CSS
●JavaScript execution time 0.0 s
●Minimizes main-thread work 0.3 s
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 40 ms
●Server Backend Latencies 80 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 270 ms
○INP breakdown
○User Timing marks and measures
○Avoid long main-thread tasks
○Avoid non-composited animations
83

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Öffentliche Ringvorlesung: Lachen in Krisenzeiten Sommersemester 2026 div#page-showcase > section.row > div#gcms-slider > div.carousel-inner

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 about input field labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Öffentliche Ringvorlesung: Lachen in Krisenzeiten Sommersemester 2026 div#page-showcase > section.row > div#gcms-slider > div.carousel-inner

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.

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
div.col-sm-6 > ul#social-buttons > li > a.facebook div.col-sm-6 > ul#social-buttons > li > a.facebook
div.col-sm-6 > ul#social-buttons > li > a.instagram div.col-sm-6 > ul#social-buttons > li > a.instagram
div.col-sm-6 > ul#social-buttons > li > a.bluesky div.col-sm-6 > ul#social-buttons > li > a.bluesky
div.col-sm-6 > ul#social-buttons > li > a.mastodon div.col-sm-6 > ul#social-buttons > li > a.mastodon
div.col-sm-6 > ul#social-buttons > li > a.youtube div.col-sm-6 > ul#social-buttons > li > a.youtube
div.col-sm-6 > ul#social-buttons > li > a.linkedin div.col-sm-6 > ul#social-buttons > li > a.linkedin

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

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 about the viewport meta tag.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
head > meta head > meta

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
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○`[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.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[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>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○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.
96

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
TypeError: Cannot read properties of null (reading 'addEventListener') at HTMLDocument.<anonymous> (https://uni-goettingen.de/js/chatai-popup.js:80:10)
●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 issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
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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