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Accessibility

· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.
SCORE
68
GRADE
D
FIX
3
REVIEW
5
PASS
5
INFO
0
Checks
13
5 PASS 5 REVIEW 3 FIX
D
Dark Mode Support
Action
No dark mode signals
FIX
No dark mode signals
Info::
No dark mode signals detected
Consider adding CSS with @media (prefers-color-scheme: dark) and <meta name='color-scheme' content='light dark'>.
Info::
Detection limited to meta tags and inline styles
External CSS files may contain prefers-color-scheme rules not visible to this scan.
Dark ModeNo Dark Mode Detected
color-scheme meta Not set ✗Dark theme-color Not set ✗CSS indicators Not detected ✗

Detection limited to meta tags and inline styles.

D
Print Stylesheet
Action
No print styles
FIX
No print styles
Info::
No print-specific styles detected
When users print this page, they get the screen layout including navigation and non-essential elements. Add @media print rules to hide navigation and optimize layout for paper.
Print Stylesheet No Print Styles
Print stylesheet Not found ✗Inline @media print Not detected ✗
F
Navigation UX
Action
1 navigation pattern(s)
FIX
1 navigation pattern(s)
Info::
Back-to-top link detected
Info::
1 navigation landmark(s) detected
Info::
Hamburger menu detected (responsive design)
Info::
No breadcrumbs, search, or skip link detected
These navigation aids help users orient themselves and find content efficiently, especially on large sites.
Breadcrumbs
Search
Skip Link
Labeled Navigation 1 <nav> element(s)
Back to Top
Hamburger Menu
Sticky Navigation Cannot reliably detect (CSS-based)
3 of 6 testable patterns navigation patterns detected. Strong navigation UX with multiple discovery paths.
B
Heading Hierarchy
62 headings, 2 skip(s)
REVIEW
62 headings, 2 skip(s)
Info::
Single H1 present
Warning::
Heading level skipped: H2 → H5 (missing H3)
Skipping heading levels breaks the document outline. Screen readers may interpret missing levels as structural errors.
Warning::
Heading level skipped: H2 → H4 (missing H3)
Skipping heading levels breaks the document outline. Screen readers may interpret missing levels as structural errors.
  • H1 KI-Agenten erforschen
  • H2 Ausweg aus dem Collingridge-Dilemma
  • H2 Künstliche Intelligenz
  • H2 Aktuelles aus der Forschung
  • H3 Ungarn-Urteil: Klare Ansage an Mitgliedstaaten
  • H3 Nahrung kann die Vielfalt im Darm erhalten
  • H3 epiray revolutioniert die Dünnschichttechnologie
  • H2 Internationales
  • H3 Zwei interdisziplinäre Dioscuri-Zentren in Polen
  • H3 Zwischen Spitzenforschung und Verantwortung
  • H3 Neugier, die keine Grenzen kennt
  • H2 Karriere
  • H3 Eine erstklassige Doktorandenausbildung
  • H3 Neue Max Planck School of Biomedical Artificial Intelligence
  • H3 Stellenangebote
  • H4 Sekretär*in für den Betriebsrat (m/w/d)
  • H4 Studentische Hilfskraft im Bereich Internationale Beziehungen für das Dioscuri-Center-Programm (Teilzeit 50%)
  • H4 Servicemitarbeiter/in auf Minijob-Basis (m/w/d) in Teilzeit (8-10h/Woche)
  • H2 Themen-Specials
  • H3 Das Gehirn
  • H3 Künstliche Intelligenz
  • H3 Altern im Fokus
  • H2 Podcasts und Videos
  • H3 Warum Europa jetzt in Spitzenforschung investieren muss
  • H3 Welche Perspektiven gibt es für die Ökonomie?
  • H3 Ausweg aus dem Collingridge-Dilemma
  • H3 Neues aus der Medizin
  • H3 Neue Symbionten im Abwasser produzieren Lachgas
  • H3 Warum Europa jetzt in Spitzenforschung investieren muss
  • H3 Welche Perspektiven gibt es für die Ökonomie?
  • H3 Ausweg aus dem Collingridge-Dilemma
  • H3 Neues aus der Medizin
  • H3 Neue Symbionten im Abwasser produzieren Lachgas
  • H3 Warum Europa jetzt in Spitzenforschung investieren muss
  • H3 Welche Perspektiven gibt es für die Ökonomie?
  • H2 Veranstaltungen
  • H5 Schülerpraktikum "Verfahrenstechnik und Technische Kybernetik" 2026 skipped
  • H5 Schülerpraktikum "Verfahrenstechnik und Technische Kybernetik" 2026
  • H5 Im Feuerwerk der Sonne: Polarlicher: Faszination und aktuelle Forschung (Yasuhito Narita)
  • H5 Wissenschaft und bildende Kunst im Dialog
  • H5 Öffentlicher Vortrag „Gravitationswellenastronomie: Erkenntnisse und Rätsel nach über 300 Beobachtungen“
  • H5 Im Feuerwerk der Sonne: Gefahren von Weltraumwetter für unsere moderne Infrastruktur (Volker Bothmer)
  • H5 Gefiederte Intelligenz - Rabenvögel und Papageien und was sie uns über die Evolution von Intelligenz verraten
  • H5 Girls´Day 2026 im Fritz-Haber-Institut, Berlin
  • H5 Girls' Day 2026 im Max-Planck-Institut für Plasmaphysik (IPP)
  • H5 Girls'Day - Mädchen-Zukunftstag
  • H5 Girls' Day 2026 am AEI Hannover
  • H5 Der Zukunftstag - Girls' und Boys' Day: Berufe und Aufgaben in einer ingenieurwissenschaftlichen Forschungseinrichtung
  • H5 Zukunftstag 2026
  • H5 Heimspiel Wissenschaft - Max-Planck-Edition
  • H5 Plant-based – die Zukunft? Was denken Forscher über Fleischersatz.
  • H3 Kommende Veranstaltungen
  • H4 Gefiederte Intelligenz - Rabenvögel und Papageien und was sie uns über die Evolution von Intelligenz verraten
  • H4 Girls´Day 2026 im Fritz-Haber-Institut, Berlin
  • H4 Girls' Day 2026 im Max-Planck-Institut für Plasmaphysik (IPP)
  • H2 Aktuelles aus den Instituten
  • H2 Publikationen
  • H2 Soziale Medien
  • H4 Quick Links skipped
  • H4 Social Media
  • H4 Social Media
  • H2 Benachrichtigungs-Einstellungen

Skipping heading levels breaks the document outline. Screen readers may interpret missing levels as structural errors.

Why this matters

Skipping heading levels breaks the document outline — screen-reader users lose track of section nesting.

Learn more ▾

Screen reader users navigate by jumping between headings (H1 → H2 → H3). Skipping (H1 → H3) breaks the sense of hierarchy. Use sequential levels even if you don't like the default styling — restyle with CSS instead. WCAG 1.3.1 (Info and Relationships) treats this as an A failure.

Source: WCAG 2.1 SC 1.3.1 / W3C WAI

Skipping heading levels breaks the document outline. Screen readers may interpret missing levels as structural errors.

Why this matters

Skipping heading levels breaks the document outline — screen-reader users lose track of section nesting.

Learn more ▾

Screen reader users navigate by jumping between headings (H1 → H2 → H3). Skipping (H1 → H3) breaks the sense of hierarchy. Use sequential levels even if you don't like the default styling — restyle with CSS instead. WCAG 1.3.1 (Info and Relationships) treats this as an A failure.

Source: WCAG 2.1 SC 1.3.1 / W3C WAI

B
404 Error Page
HTTP 404, custom page
REVIEW
HTTP 404, custom page
Info::
Correct 404 status code returned
Got: HTTP 404
Info::
Custom styled 404 page
Info::
Navigation links present on 404 page
Info::
Search form present on 404 page
404 Page Quality ✓ Custom 404 Page
Status Code HTTP 404 ✓Page Title Max-Planck-Gesellschaft ✓Custom Styling ✓Navigation ✓Homepage Link ✗Search Form ✓
B
Favicon & Branding
4 icon(s) detected
REVIEW
4 icon(s) detected
Info::
favicon.ico present at site root
Info::
HTML icon links detected
Info::
Apple touch icon present
Info::
Multiple icon sizes detected
✓ favicon.ico Present
✓ PNG Icons Present
✓ Apple Touch Present
✗ SVG Favicon Missing
✓ Manifest Icons Present
✓ Multiple Sizes Present
C
Color Contrast (Screenshot)
Action
20 text elements analyzed, 2 fail WCAG AA
REVIEW

Analyzes text contrast against the actual rendered page, including background images, gradients, and overlays that CSS-based tools cannot detect.

18 pass 2 fail WCAG AA
a Porträt
1.02:1
#000000
on
#050200
needs 4.5:1 (normal text)
16px · above the fold
a Nachhaltigkeit
1.20:1
#000000
on
#191827
needs 4.5:1 (normal text)
16px · above the fold · over background image/gradient

1 contrast failures on background images/gradients

These failures are invisible to CSS-based accessibility tools like Lighthouse. The text may be fine on a solid background, but fails when rendered over an image or gradient.

Show all checked elements (20)
ElementRatioRequiredFGBGResult
h2 Aktuelles aus der Fo…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Internationales21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Karriere21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Themen-Specials21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Podcasts und Videos21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Veranstaltungen21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Aktuelles aus den In…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Publikationen21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Soziale Medien21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Benachrichtigungs-Ei…21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Stellenangebote21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Kommende Veranstaltu…21.00:13.0:1
#000000
#FFFFFF
Pass
title Max-Planck-Gesellsch…18.10:14.5:1
#000000
#EEEEEE
Pass
a English18.10:14.5:1
#000000
#EEEEEE
Pass
span Toggle navigation18.10:14.5:1
#000000
#EEEEEE
Pass
a Über uns18.10:14.5:1
#000000
#EEEEEE
Pass
a Forschung fördern18.10:14.5:1
#000000
#EEEEEE
Pass
a Profil & Selbstverst…18.10:14.5:1
#000000
#EEEEEE
Pass
a Porträt1.02:14.5:1
#000000
#050200
Fail
a Nachhaltigkeit1.20:14.5:1
#000000
#191827
Fail

Methodology: The top 20 text elements by font size were checked. Background color was sampled from the desktop screenshot using a 5-point pattern. WCAG 2.1 AA requires 4.5:1 for normal text and 3:1 for large text.

A
Landmark Structure
7 landmarks
PASS
7 landmarks
Info::
<main> landmark present
Info::
1 <nav> landmark(s) found
Warning::
Skip navigation link is missing (WCAG 2.4.1)
Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.
Page Structure — as a screen reader sees it
BANNER header NAV "Hauptnavigation" MAIN CONTENTINFO footer

Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.

Why this matters

Without a skip-nav link, keyboard users tab through every nav item before reaching content — every page, every visit.

Learn more ▾

WCAG 2.4.1 (Bypass Blocks) requires a mechanism to skip past repeated content. The standard implementation is a 'Skip to main content' link that's the first focusable element, visually hidden until focused. Three lines of HTML + four of CSS.

Source: WCAG 2.1 SC 2.4.1

A
Alt Text Quality
All 49 images OK
PASS
All 49 images OK
Info::
10 image(s) with alt text over 125 characters
Info::
39 image(s) with good alt text
49 images 39 good alt text
IssueCount
too long10 image(s)
A+
Form Accessibility
All 4 controls labeled
PASS
All 4 controls labeled
Info::
4 control(s) properly labeled
4 controls
4 labeled
0 placeholder only
0 unlabeled
ControlTypeLabelMethod
searchfieldsearchBitte geben Sie einen Suchbegriff ein.aria-label
searchfieldsearchBitte geben Sie einen Suchbegriff ein.aria-label
#pwa-notification-decheckboxBenachrichtigungen für deutsche Inhalte empfangenfor/id
#pwa-notification-encheckboxBenachrichtigungen für englische Inhalte empfangenfor/id
A
Web Manifest
PWA-ready
PASS
PWA-ready
Info::
Meets PWA install criteria
Info::
Name present: Max Planck Gesellschaft
Info::
192x192 icon present
Info::
Display mode: standalone
PWA Install Criteria ✓ Installable
Name Max Planck Gesellschaft ✓192×192 icon ✓512×512 icon ✗Start URL https://www.mpg.de/de ✓Display Mode standalone ✓
Name Max Planck Gesellschaft Display Mode standalone Background Color #006c66 Icons 1 icon(s)
A
Lighthouse Accessibility Audits
Score 90/100 — 4 failing, 23 passed
PASS
90

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
10 table.calendar_table > tbody > tr > td.day
11 table.calendar_table > tbody > tr > td.day
12 table.calendar_table > tbody > tr > td.day
13 table.calendar_table > tbody > tr > td.day
14 table.calendar_table > tbody > tr > td.day
15 table.calendar_table > tbody > tr > td.day
16 table.calendar_table > tbody > tr > td.day
17 table.calendar_table > tbody > tr > td.day
18 table.calendar_table > tbody > tr > td.day
19 table.calendar_table > tbody > tr > td.day
20 table.calendar_table > tbody > tr > td.day
22 table.calendar_table > tbody > tr > td.day
23 table.calendar_table > tbody > tr > td.day
24 table.calendar_table > tbody > tr > td.day
25 table.calendar_table > tbody > tr > td.day
26 table.calendar_table > tbody > tr > td.day
27 table.calendar_table > tbody > tr > td.day
28 table.calendar_table > tbody > tr > td.day
29 table.calendar_table > tbody > tr > td.day
30 table.calendar_table > tbody > tr > td.day

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
Quick Links div.row > div.col-md-12 > div.footer-focus > h4.h3

These are opportunities to improve keyboard navigation in your application.

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
Zahlen & Fakten div.footer-focus > ul.footer-links > li > a
Jahresbericht div.footer-focus > ul.footer-links > li > a
Bluesky div.footer-focus > ul.footer-links > li > a.external
Mastodon div.footer-focus > ul.footer-links > li > a.external

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Previous div.container > div.slick-slider > div.slick-slider-content > button.slick-prev
Next div.container > div.slick-slider > div.slick-slider-content > button.slick-next
Previous div.container > div.slick-slider > div.box-color-slider > button.slick-prev
Next div.container > div.slick-slider > div.box-color-slider > button.slick-next
○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>`
●`[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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●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
●Links are distinguishable without relying on color.
●Links have a discernible name
●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
●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
●Document has a main landmark.
●Identical links have the same purpose.
●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.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Deprecated ARIA roles were not used
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○`[role]`s have all required `[aria-*]` attributes
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○`[role]` values are valid
○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
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○`<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.
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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