Accessibility

· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Checks

5 PASS 4 REVIEW 4 FIX

Link & Button Quality

Action

4 issue(s) across 294 links and 32 buttons

FIX

4 issue(s) across 294 links and 32 buttons

2 link(s) with no accessible text

Links without text are announced as raw URLs by screen readers.

Got: a#main-menu-anchor; /

1 image-only link(s) without alt text

Image-only links need alt text on the image (or aria-label on the link) so screen readers can announce them.

Got: a#footer_nav_link_13395

32 link(s) open in new tab without warning

Add '(opens in new tab)' to link text or aria-label.

Got: https://tiss.tuwien.ac.at/mbl/main; https://www.tuaustria.at/; https://cts.wien; https://maps.tuwien.ac.at; https://it.tuwien.ac.at; https://ar.tuwien.ac.at/fakultaet; https://informatics.tuwien.ac.at/; https://jobs.tuwien.ac.at/; https://www.facebook.com/tuwien/; https://www.linkedin.com/school/tuwien (+22 more)

2 button(s) with no accessible text

Icon-only buttons need an aria-label so screen readers can announce them.

Got: button.swiper-button-prev (#824 on page); button.swiper-button-next (#1069 on page)

259 link(s) with descriptive text

294 links

2 empty

0 generic text

32 new tab

2 empty buttons

Element	Text	Issue	Suggested Fix
https://tiss.tuwien.ac.at/mbl/main	Mitteilungsblätter …	new tab	Add '(opens in new tab)' to text
https://www.tuaustria.at/	TUAustria …	new tab	Add '(opens in new tab)' to text
https://cts.wien	Center für Technology and Soc…	new tab	Add '(opens in new tab)' to text
https://maps.tuwien.ac.at	TUW Maps …	new tab	Add '(opens in new tab)' to text
https://it.tuwien.ac.at	Campus IT …	new tab	Add '(opens in new tab)' to text
https://ar.tuwien.ac.at/fakultaet	Architektur und Raumplanung …	new tab	Add '(opens in new tab)' to text
https://informatics.tuwien.ac.at/	Informatik …	new tab	Add '(opens in new tab)' to text
https://jobs.tuwien.ac.at/	Jobangebote …	new tab	Add '(opens in new tab)' to text
https://www.facebook.com/tuwien/	Facebook	new tab	Add '(opens in new tab)' to text
https://www.linkedin.com/school/tuwien	LinkedIn	new tab	Add '(opens in new tab)' to text
https://www.youtube.com/user/tuwienprmed…	YouTube	new tab	Add '(opens in new tab)' to text
https://www.instagram.com/tu_wien/	Instagram	new tab	Add '(opens in new tab)' to text
https://bsky.app/profile/tuwien.at	Bluesky	new tab	Add '(opens in new tab)' to text
	(empty)	empty	Add link text or aria-label
https://tiss.tuwien.ac.at/mbl/main	Mitteilungsblätter …	new tab	Add '(opens in new tab)' to text
https://www.tuaustria.at/	TUAustria …	new tab	Add '(opens in new tab)' to text
https://cts.wien	Center für Technology and Soc…	new tab	Add '(opens in new tab)' to text
https://maps.tuwien.ac.at	TUW Maps …	new tab	Add '(opens in new tab)' to text
https://it.tuwien.ac.at	Campus IT …	new tab	Add '(opens in new tab)' to text
https://ar.tuwien.ac.at/fakultaet	Architektur und Raumplanung …	new tab	Add '(opens in new tab)' to text
https://informatics.tuwien.ac.at/	Informatik …	new tab	Add '(opens in new tab)' to text
https://jobs.tuwien.ac.at/	Jobangebote …	new tab	Add '(opens in new tab)' to text
/	(empty)	empty	Add link text or aria-label
https://www.facebook.com/tuwien/	Facebook …	new tab	Add '(opens in new tab)' to text
https://www.linkedin.com/school/tuwien	LinkedIn …	new tab	Add '(opens in new tab)' to text
https://www.youtube.com/user/tuwienprmed…	YouTube …	new tab	Add '(opens in new tab)' to text
https://www.instagram.com/tu_wien/	Instagram …	new tab	Add '(opens in new tab)' to text
https://bsky.app/profile/tuwien.at	Bluesky …	new tab	Add '(opens in new tab)' to text
https://cts.wien/	Center for Technology and Soci…	new tab	Add '(opens in new tab)' to text
https://www.tuaustria.ac.at/	TU Austria, öffnet eine exter…	new tab	Add '(opens in new tab)' to text
https://www.it.tuwien.ac.at/	Campus IT-Services	new tab	Add '(opens in new tab)' to text
https://jobs.tuwien.ac.at/Jobs	Karriere, öffnet eine externe…	new tab	Add '(opens in new tab)' to text
https://login.tuwien.ac.at/portal	Portal (TISS, SAP, TYPO3,...),…	new tab	Add '(opens in new tab)' to text
/tu-wien/kontakt/barrierefreiheitserklae…	Barrierefreiheitserklärung	img no alt	Add alt attribute to the image
https://www.tuwien.at/index.php?eID=dump…	Datenschutzerklärung (PDF)	new tab	Add '(opens in new tab)' to text
<button>	(empty)	empty	Add button text or aria-label
<button>	(empty)	empty	Add button text or aria-label

289 links and buttons have descriptive text

Links without text are announced as raw URLs by screen readers.

a#main-menu-anchor; /

Why this matters

Links with no accessible text (empty <a></a>, image-only no alt, icon-only no aria-label) are unidentifiable to screen readers.

Source: WCAG 2.1 SC 2.4.4

Image-only links need alt text on the image (or aria-label on the link) so screen readers can announce them.

a#footer_nav_link_13395

Why this matters

Image-only links with no alt are unidentifiable to screen-reader users — link's destination is invisible.

Source: WCAG 2.1 SC 2.4.4

Add '(opens in new tab)' to link text or aria-label.

https://tiss.tuwien.ac.at/mbl/main; https://www.tuaustria.at/; https://cts.wien; https://maps.tuwien.ac.at; https://it.tuwien.ac.at; https://ar.tuwien.ac.at/fakultaet; https://informatics.tuwien.ac.at/; https://jobs.tuwien.ac.at/; https://www.facebook.com/tuwien/; https://www.linkedin.com/school/tuwien (+22 more)

Why this matters

Links with target="_blank" without rel="noopener" leak the originating page's window context — security and UX issue.

Learn more ▾

Without rel="noopener", the new tab can navigate the original tab via window.opener (tab-nabbing attack). Modern browsers default to noopener for target=_blank but only since recent versions. Always set rel="noopener noreferrer" explicitly.

Source: MDN target / OWASP

Icon-only buttons need an aria-label so screen readers can announce them.

button.swiper-button-prev (#824 on page); button.swiper-button-next (#1069 on page)

Why this matters

Buttons with no accessible text (icon-only, no aria-label) can't be activated by voice control or understood by screen readers.

Source: WCAG 2.1 SC 4.1.2

Dark Mode Support

Action

Theme color only

FIX

Theme color only

Theme-color present but no dark variant

A theme-color is set but no dark-specific variant was found. The browser toolbar may not adapt for dark mode users.

Got: #ffffff

No dark mode signals detected

Consider adding CSS with @media (prefers-color-scheme: dark) and <meta name='color-scheme' content='light dark'>.

Detection limited to meta tags and inline styles

External CSS files may contain prefers-color-scheme rules not visible to this scan.

Dark ModePartial Dark Mode

color-scheme meta Not set ✗Dark theme-color Not set ✗CSS indicators Not detected ✗

Detection limited to meta tags and inline styles.

Print Stylesheet

Action

No print styles

FIX

No print styles

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 ✗

404 Error Page

HTTP 404, custom page

REVIEW

HTTP 404, custom page

Correct 404 status code returned

Got: HTTP 404

Custom styled 404 page

Navigation links present on 404 page

404 Page Quality ✓ Custom 404 Page

Status Code HTTP 404 ✓Page Title Fehler 404 | TU Wien ✓Custom Styling ✓Navigation ✓Homepage Link ✗Search Form ✗

Favicon & Branding

7 icon(s) detected

REVIEW

7 icon(s) detected

favicon.ico present at site root

HTML icon links detected

Apple touch icon present

Multiple icon sizes detected

✓ favicon.ico Present

✓ PNG Icons Present

✓ Apple Touch Present

✗ SVG Favicon Missing

✓ Manifest Icons Present

✓ Multiple Sizes Present

Web Manifest

Valid manifest

REVIEW

Valid manifest

Name present: TU Wien

192x192 icon present

512x512 icon present

Display mode: standalone

PWA Install Criteria Not Installable

Name TU Wien ✓192×192 icon ✓512×512 icon ✓Start URL ✗Display Mode standalone ✓

Name TU Wien Display Mode standalone Theme Color #ffffff Background Color #ffffff Icons 2 icon(s)

Color Contrast (Screenshot)

Action

20 text elements analyzed, 14 fail WCAG AA

REVIEW

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

6 pass 14 fail WCAG AA 6 pass AA only

title Technische Universität Wien | TU Wien

3.60:1

#000000

#656565

needs 4.5:1 (normal text)

16px · top of page (header area)

span Zum Inhalt springen

2.45:1

#000000

#4D4C4B

needs 4.5:1 (normal text)

16px · top of page (header area) · over background image/gradient

span (Accesskey: 1)

1.34:1

#000000

#252320

needs 4.5:1 (normal text)

16px · top of page (header area)

span Zur Navigation springen

1.27:1

#000000

#221E1B

needs 4.5:1 (normal text)

16px · top of page (header area)

span (Accesskey: 2)

1.28:1

#000000

#211F1D

needs 4.5:1 (normal text)

16px · above the fold

span Zur Suche springen

1.30:1

#000000

#2A1E17

needs 4.5:1 (normal text)

16px · above the fold

span (Accesskey: 7)

1.29:1

#000000

#1C2211

needs 4.5:1 (normal text)

16px · above the fold

span Seitennavigation schließen

1.90:1

#000000

#3C3C3C

needs 4.5:1 (normal text)

16px · above the fold · over background image/gradient

span TU Login

3.60:1

#000000

#656565

needs 4.5:1 (normal text)

16px · above the fold

span Hauptmenü

3.34:1

#000000

#606060

needs 4.5:1 (normal text)

16px · above the fold

span Quicklinks

3.44:1

#000000

#626262

needs 4.5:1 (normal text)

16px · above the fold

span Quicklinks-Menü umschalten

3.44:1

#000000

#626262

needs 4.5:1 (normal text)

16px · above the fold

span TU Wien

3.44:1

#000000

#626262

needs 4.5:1 (normal text)

16px · above the fold

span Aktuelles

3.44:1

#000000

#626262

needs 4.5:1 (normal text)

16px · mid-page

2 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)

Element	Ratio	Required	FG	BG	Result
h1 TU Wien – where we…	3.44:1	3.0:1	#000000	#626262	Pass
h1 The creative urban t…	3.44:1	3.0:1	#000000	#626262	Pass
h1 Unlimited.	3.44:1	3.0:1	#000000	#626262	Pass
h1 Hinweis zu Cookies u…	3.44:1	3.0:1	#000000	#626262	Pass
h2 Neues aus der TU Wie…	3.44:1	3.0:1	#000000	#626262	Pass
h2 Fakten zur TU Wien	3.44:1	3.0:1	#000000	#626262	Pass
title Technische Universit…	3.60:1	4.5:1	#000000	#656565	Fail
span Zum Inhalt springen	2.45:1	4.5:1	#000000	#4D4C4B	Fail
span (Accesskey: 1)	1.34:1	4.5:1	#000000	#252320	Fail
span Zur Navigation sprin…	1.27:1	4.5:1	#000000	#221E1B	Fail
span (Accesskey: 2)	1.28:1	4.5:1	#000000	#211F1D	Fail
span Zur Suche springen	1.30:1	4.5:1	#000000	#2A1E17	Fail
span (Accesskey: 7)	1.29:1	4.5:1	#000000	#1C2211	Fail
span Seitennavigation sch…	1.90:1	4.5:1	#000000	#3C3C3C	Fail
span TU Login	3.60:1	4.5:1	#000000	#656565	Fail
span Hauptmenü	3.34:1	4.5:1	#000000	#606060	Fail
span Quicklinks	3.44:1	4.5:1	#000000	#626262	Fail
span Quicklinks-Menü ums…	3.44:1	4.5:1	#000000	#626262	Fail
span TU Wien	3.44:1	4.5:1	#000000	#626262	Fail
span Aktuelles	3.44:1	4.5:1	#000000	#626262	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.

Landmark Structure

13 landmarks

PASS

13 landmarks

<main> landmark present

6 <nav> landmark(s) found

All <nav> elements are properly labeled

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.

Search landmark present

Page Structure — as a screen reader sees it

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

Heading Hierarchy

22 headings

PASS

22 headings

Multiple H1 headings (2 found)

A page should have only one H1. Multiple H1s dilute the document outline.

H1 TU Wien – where we dare to reason. The creative urban tech university. Unlimited.
H2 Neues aus der TU Wien
H3 Forschungsdaten – we care to make it FAIR! – Teil 2
H3 Übersehener Effekt: Halbleiterindustrie setzt auf falsche Materialien
H3 Let’s run: Die TU Wien beim Vienna City Marathon 2026
H3 Neue Professuren an der TU Wien
H3 fuTUre fit Projekt: TU Wien Hauptgebäude – fit for future
H3 Lange Nacht der Forschung – wir sind dabei!
H3 TU Wien unter den Top 5 im österreichischen Patent-Ranking
H3 La Quinta Stagione: TU Wien Orchester lädt zu besonderem Konzertabend
H3 Medikamente zur richtigen Zeit am richtigen Ort
H3 Kanada und TU Austria vertiefen Forschungskooperation
H3 Univ.Prof. Cuno Brullmann (1945-2026): Ein Nachruf
H3 Das Unendliche stürzt uns ins Chaos
H2 Fakten zur TU Wien
H2 TU Wien
H2 Studium
H2 Forschung
H2 Kooperationen
H2 Services
H2 Intern
H1 Hinweis zu Cookies und anderen Techniken duplicate H1

A page should have only one H1. Multiple H1s dilute the document outline.

Why this matters

Multiple H1s blur the page's primary topic — screen-reader users and Google both prefer one H1.

Learn more ▾

HTML5's outline algorithm technically allows multiple H1s within sectioning content, but no browser implements it. In practice: one H1 per page. Use H2-H6 for subsections.

Source: WCAG 2.4.6 / Google Search Central

A+

Alt Text Quality

All 15 images OK

PASS

All 15 images OK

2 image(s) with alt text over 125 characters

1 decorative image(s) correctly marked

12 image(s) with good alt text

15 images 12 good alt text 1 decorative

Issue	Count
too long	2 image(s)

A+

Form Accessibility

All 4 controls labeled

PASS

All 4 controls labeled

4 control(s) properly labeled

4 controls

4 labeled

0 placeholder only

0 unlabeled

Control	Type	Label	Method
query	search	Suche	aria-label
#mandatory	checkbox	Erforderliche Cookies zulassen	for/id
#statistic	checkbox	Statistik Cookies zulassen	for/id
#marketing	checkbox	Marketing Cookies zulassen	for/id

A+

Lighthouse Accessibility Audits

Score 97/100 — 1 failing, 33 passed

PASS

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

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
Hinweis zu Cookies und anderen Techniken × Unsere Website verwendet Cookies un… `body.mm-wrapper > div#cookieman-modal`

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.

○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

●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

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●`[accesskey]` values are unique

●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

●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

●Touch targets have sufficient size and spacing.

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●Elements with visible text labels have matching accessible names.

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○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.

○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.

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.