Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
prins.uni-goettingen.de/files/bilder/pic_26a3230f6620260417102444.jpg	0.0 ms	474.0 KiB
prins.uni-goettingen.de/files/bilder/pic_e5ae45dc6c20260416111252.jpg	0.0 ms	104.7 KiB
prins.uni-goettingen.de/files/bilder/pic_5293d0331120260417082705.jpg	0.0 ms	72.1 KiB
prins.uni-goettingen.de/files/bilder/pic_dc12ec300720260421104624.jpg	0.0 ms	46.5 KiB
uni-goettingen.de/js/jquery/jquery-3.5.1.min.js	0.0 ms	34.2 KiB
prins.uni-goettingen.de/files/bilder/pic_08e00e47a020260420095435.jpg	0.0 ms	28.0 KiB
uni-goettingen.de/img/redesign/siegel.svg	0.0 ms	24.2 KiB
matomo.gwdg.de/matomo.js	0.0 ms	21.8 KiB
prins.uni-goettingen.de/files/bilder/pic_df44b9274b20260422150715.jpg	0.0 ms	14.4 KiB
uni-goettingen.de/img/redesign/print-logo.svg	0.0 ms	8.7 KiB
uni-goettingen.de/css/default.css?v=1	0.0 ms	6.8 KiB
uni-goettingen.de/img/redesign/logo.svg	0.0 ms	6.5 KiB
uni-goettingen.de/js/jquery/jquery.offcanvas.js	0.0 ms	5.8 KiB
uni-goettingen.de/css/offcanvas.css	0.0 ms	3.5 KiB
uni-goettingen.de/js/chatai-popup.js	0.0 ms	3.0 KiB
uni-goettingen.de/css/carousel.css	0.0 ms	1.9 KiB
uni-goettingen.de/css/chatAI.css	0.0 ms	1.5 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
uni-goettingen.de/resources/font-awesome/webfonts/fa-solid-900.woff2	195 ms
uni-goettingen.de/resources/fonts/OpenSans-Regular.ttf	190 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div#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	473.7 KiB	457.2 KiB
Öffentliche Ringvorlesung: Lachen in Krisenzeiten Sommersemester 2026 `div.carousel-inner > div.item > a > img`	www.uni-goettingen.de/storage/pictures/180347.png	463.8 KiB	455.1 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.jpg	104.4 KiB	87.9 KiB
Nature Positive Universities `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/5ae8aa86003bbb12f6c7c3be78135918.png	78.6 KiB	76.8 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.jpg	84.1 KiB	73.1 KiB
Diversity Re-Audit 2024 `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/161159.jpg	68.7 KiB	66.9 KiB
Charta der Vielfalt `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/45dab66f9d4749f550ae25453e18e0ea.jpg	65.7 KiB	63.8 KiB
Familie in der Hochschule `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/025d2c0f40c545b084d0c833cb1bfe5b.jpg	65.4 KiB	63.6 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_5293d0331120260417082705.jpg	71.9 KiB	55.4 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.png	56.5 KiB	45.5 KiB
German U15 `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/ffcaeb3a090217fdd2a8a47f28c3f47c.jpg	45.0 KiB	43.2 KiB
The Guild `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/25cd9f69a6f57b421d56b46365c8a81e.jpg	37.9 KiB	36.0 KiB
Scholars at Risk `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/9e40a7dc74992ead660af0fe878adccc.jpg	36.6 KiB	34.8 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.jpg	46.2 KiB	33.2 KiB
European University Association (EUA) `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/6b3b90e8ff52f8d46e3227a5ad4160e2.jpg	33.9 KiB	32.1 KiB
HeKKSaGOn `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/7f6f237ad3c95a405a3a14f3da4d0474.jpg	32.2 KiB	30.3 KiB
Stoppt sexualisierte Belästigung und Gewalt `div#page-content > div.banner > a.col-sm-4 > img.img-responsive`	uni-goettingen.de/storage/pictures/164108.png	40.8 KiB	29.8 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.jpg	27.7 KiB	19.9 KiB
Deutschlandstipendium Logo `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/ac733cb0b2575c4f3ad6b2da2935b6a5.png	20.6 KiB	18.7 KiB
Initiative transparente Tierversuche `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/f34d872115b916a1703a9eb3708298c0.png	19.4 KiB	18.4 KiB
ENLIGHT `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/167451.jpg	19.0 KiB	17.3 KiB
Weltoffene Hochschule Logo `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/0b1b54ca9e89ef6c46b1275d57a4b797.png	16.3 KiB	14.9 KiB
Göttingen Campus Logo `div.slick-track > div.slide > a > img.img-responsive`	uni-goettingen.de/storage/pictures/8343f97999fbfe69e90d22a1ec70a9f3.png	10.6 KiB	9.6 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:345.3329990234375 label:Time to first byte subpart:timeToFirstByte] map[duration:2168.6400009765625 label:Element render delay subpart:elementRenderDelay]]

lhId: page-23-P

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,0,P

selector: div.container-fluid > div#page-content > article.col-sm-12 > p.text

snippet: <p class="text">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

title: Preconnected origins

value: no origins were preconnected

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

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
matomo.gwdg.de/matomo.js	21.8 KiB	1.1 s
uni-goettingen.de/resources/IFrameShield/iFrameShield.js	3.2 KiB
uni-goettingen.de/js/chatai-popup.js	3.0 KiB
uni-goettingen.de/js/jquery/jquery.offcanvas.js	5.8 KiB
uni-goettingen.de/resources/fancybox/jquery.fancybox.min.js	24.5 KiB	181 ms
uni-goettingen.de/resources/bootstrap/js/bootstrap.min.js	12.7 KiB	181 ms
uni-goettingen.de/js/jquery/jquery-3.5.1.min.js	34.2 KiB	363 ms
uni-goettingen.de/css/default.css?v=1	6.8 KiB
uni-goettingen.de/css/offcanvas.css	3.5 KiB
uni-goettingen.de/resources/IFrameShield/iFrameShield.css	2.5 KiB
uni-goettingen.de/css/chatAI.css	1.5 KiB
uni-goettingen.de/resources/fancybox/jquery.fancybox.min.css	3.6 KiB	181 ms
uni-goettingen.de/resources/font-awesome/css/all.min.css	14.4 KiB
uni-goettingen.de/resources/bootstrap/css/bootstrap.min.css	23.6 KiB	544 ms

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
prins.uni-goettingen.de/files/bilder/pic_df44b9274b20260422150715.jpg	http/1.1
prins.uni-goettingen.de/files/bilder/pic_26a3230f6620260417102444.jpg	http/1.1
prins.uni-goettingen.de/files/bilder/pic_dc12ec300720260421104624.jpg	http/1.1
prins.uni-goettingen.de/files/bilder/pic_08e00e47a020260420095435.jpg	http/1.1
prins.uni-goettingen.de/files/bilder/pic_5293d0331120260417082705.jpg	http/1.1
prins.uni-goettingen.de/files/bilder/pic_e5ae45dc6c20260416111252.jpg	http/1.1

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

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: 300 ms 35.6 KiB

URL	Transfer Size	Est Savings
uni-goettingen.de/resources/bootstrap/css/bootstrap.min.css	23.4 KiB	21.6 KiB
uni-goettingen.de/resources/font-awesome/css/all.min.css	14.2 KiB	14.0 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: 150 ms 20.1 KiB

URL	Transfer Size	Est Savings
matomo.gwdg.de/matomo.js	21.6 KiB	20.1 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 3.1 KiB

URL	Transfer Size	Est Savings
uni-goettingen.de/js/jquery/jquery.offcanvas.js	5.7 KiB	3.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
uni-goettingen.de/storage/pictures/174553.jpg	645.5 KiB
prins.uni-goettingen.de/files/bilder/pic_26a3230f6620260417102444.jpg	474.0 KiB
www.uni-goettingen.de/storage/pictures/180347.png	464.5 KiB
www.uni-goettingen.de/storage/pictures/180994.png	218.5 KiB
uni-goettingen.de/resources/fonts/OpenSans-Regular.ttf	212.7 KiB
www.uni-goettingen.de/storage/pictures/180345.png	201.5 KiB
prins.uni-goettingen.de/files/bilder/pic_e5ae45dc6c20260416111252.jpg	104.7 KiB
uni-goettingen.de/img/redesign/favicons/favicon-32x32.png	99.8 KiB
uni-goettingen.de/storage/pictures/161072.jpg	84.4 KiB
uni-goettingen.de/storage/pictures/5ae8aa86003bbb12f6c7c3be78135918.png	78.9 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
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
Georg-August-Universität Göttingen `header#header-logo-container > div.container-fluid > a > img#logo`	uni-goettingen.de/img/redesign/logo.svg

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

●Max Potential First Input Delay 70 ms

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Forced reflow

●Optimize viewport for mobile

●Minify CSS

●JavaScript execution time 0.2 s

●Minimizes main-thread work 1.0 s

●Avoid long main-thread tasks 3 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 50 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 260 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

○Avoid large layout shifts

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

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
form.search-form > div.form-group > div.input-group > input#search-mobile `form.search-form > div.form-group > div.input-group > input#search-mobile`
li > form.search-form > div.form-check > input#googleRadioMobile `li > form.search-form > div.form-check > input#googleRadioMobile`
li > form.search-form > div.form-check > input#meiliRadioMobile `li > form.search-form > div.form-check > input#meiliRadioMobile`

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

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

●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

○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

○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.

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.

Source	Description
uni-goettingen.de/js/chatai-popup.js line 79, col 9	`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`