Accessibility
· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.DLink & Button QualityAction16 issue(s) across 113 links and 50 buttonsFIX
| Element | Text | Issue | Suggested Fix |
|---|---|---|---|
| /en/stories/cwi-works-closely-with-unive… | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: Cwi Works Closely With Universities | |||
| /en/stories/eu-funded-research-that-make… | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: Eu Funded Research That Makes A Difference | |||
| /en/research/innovation-research-focus-a… | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: Innovation Research Focus Areas | |||
| /en/events/research-semester-programmes/ | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: Research Semester Programmes | |||
| /en/research/ | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: Research | |||
| /en/stories/cwi-works-closely-with-unive… | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: Cwi Works Closely With Universities | |||
| /en/stories/eu-funded-research-that-make… | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: Eu Funded Research That Makes A Difference | |||
| /en/about/ | Read more | generic text | Replace with descriptive text |
Before: Read more Suggested: About | |||
| /en/news/cwis-dis-group-showcases-human-… | CWI’s DIS group showcases hu… | img no alt | Add alt attribute to the image |
| <button> | (empty) | empty | Add button text or aria-label |
| <button> | (empty) | empty | Add button text or aria-label |
| <button> | (empty) | empty | Add button text or aria-label |
| <button> | (empty) | empty | Add button text or aria-label |
| <button> | (empty) | empty | Add button text or aria-label |
| <button> | (empty) | empty | Add button text or aria-label |
| <button> | (empty) | empty | Add button text or aria-label |
| <button> | (empty) | empty | Add button text or aria-label |
Generic link text like 'click here' doesn't describe the destination.
/en/stories/cwi-works-closely-with-universities/ ("Read more"); /en/stories/eu-funded-research-that-makes-a-difference/ ("Read more"); /en/research/innovation-research-focus-areas/ ("Read more"); /en/events/research-semester-programmes/ ("Read more"); /en/research/ ("Read more"); /en/stories/cwi-works-closely-with-universities/ ("Read more"); /en/stories/eu-funded-research-that-makes-a-difference/ ("Read more"); /en/about/ ("Read more")
Generic anchor text ('click here', 'read more', 'learn more') tells screen readers and search engines nothing about the destination.
Learn more ▾ ▴
Out-of-context lists of links read by AT (one navigation pattern) become useless when every link says 'click here'. Use the destination's title or topic as anchor text. Doubles as SEO win — Google passes anchor-text relevance to the destination.
Source: WCAG 2.4.4 / Google Search Central
Image-only links need alt text on the image (or aria-label on the link) so screen readers can announce them.
a[href="/en/news/cwis-dis-group-showcases-human-computer-interaction-research-at-chi-…"]
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
Icon-only buttons need an aria-label so screen readers can announce them.
button (#86 on page); button (#102 on page); button (#118 on page); button (#134 on page); button (#150 on page); button (#166 on page); button (#182 on page); button (#198 on page)
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
DFavicon & BrandingAction3 icon(s) detectedFIX
DWeb ManifestActionNot foundFIX
No web manifest found.
DDark Mode SupportActionNo dark mode signalsFIX
Detection limited to meta tags and inline styles.
DPrint StylesheetActionNo print stylesFIX
BForm Accessibility2 of 2 controls have issuesREVIEW
| Control | Type | Label | Method |
|---|---|---|---|
| q | text | (Search website) | placeholder only |
| q | text | (Search website) | placeholder only |
Placeholder text disappears on focus and is not a reliable label.
<input type="text" name="q">; <input type="text" name="q">
Placeholder-only labels disappear when the user starts typing — they must remember what the field was for.
Learn more ▾ ▴
Placeholders are NOT labels. They vanish on input, fail color contrast checks (most are gray), and don't satisfy WCAG SC 3.3.2. Always use a real <label> alongside (or aria-labelledby).
Source: WCAG 2.1 SC 3.3.2 / Nielsen Norman
B404 Error PageHTTP 404, custom pageREVIEW
CColor Contrast (Screenshot)Action20 text elements analyzed, 20 fail WCAG AAREVIEW
Analyzes text contrast against the actual rendered page, including background images, gradients, and overlays that CSS-based tools cannot detect.
7 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 Home | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Collaboration with u… | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Featured | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Research themes | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Semester programme | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Our research groups | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Collaboration with u… | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Featured | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Latest news | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Ten years of softwar… | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Lynda Hardman receiv… | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 CWI’s DIS group sh… | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Laura Hollink appoin… | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Upcoming events | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 What we share on Ins… | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Quick links | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Podcasts (in Dutch) … | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Info | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Address | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | Fail |
| h2 Contact | 2.37:1 | 3.0:1 | #000000 | #4A4A4A | 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.
ALandmark Structure14 landmarksPASS
Multiple navigations need aria-label to distinguish them for screen readers.
Some <nav> elements lack aria-label — screen-reader users hear 'navigation' multiple times with no way to distinguish them.
Learn more ▾ ▴
When a page has multiple <nav> regions (primary, footer, breadcrumb), each needs aria-label or aria-labelledby. AT users navigate by landmark; identical 'navigation' announcements force them to enter each one to discover purpose.
Source: WAI-ARIA Authoring Practices
A+Heading Hierarchy22 headingsPASS
- H1 Home
- H2 Collaboration with universities
- H2 Featured
- H2 Research themes
- H2 Semester programme
- H2 Our research groups
- H2 Collaboration with universities
- H2 Featured
- H3 Centrum Wiskunde & Informatica (CWI) is the national research institute for mathematics and computer science in the Netherlands.
- H2 Latest news
- H2 Ten years of software engineering in the Netherlands
- H2 Lynda Hardman receives IPN Distinguished Service Award at ICT.OPEN
- H2 CWI’s DIS group showcases human-computer interaction research at CHI 2026
- H2 Laura Hollink appointed as Professor Responsible AI in Culture and Media
- H2 Upcoming events
- H2 What we share on Instagram
- H2 Quick links
- H2 Podcasts (in Dutch) and videos
- H2 Info
- H2 Address
- H2 Contact
- H2 Cookies
A+Alt Text QualityAll 8 images OKPASS
ALighthouse Accessibility AuditsScore 91/100 — 2 failing, 21 passedPASS
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Latest news div.news-list > div.block_wrapper > div.news-list__header > h2.news-list__title |
Upcoming events div.quick-links > div.block_wrapper > div.quick-links__full-width-header > h2.quick-links__title |
What we share on Instagram div.instagram-main > div.instagram-main__wrapper > div.instagram-main__header > h2.instagram-main__title |
Quick links div.block_wrapper > div.quick-links__column > div.quick-links__header > h2.quick-links__title |
Podcasts (in Dutch) and videos div.multimedia-list > div.multimedia-list__wrapper > div.multimedia-list__header > h2.multimedia-list__title |
These are opportunities to improve the legibility of your content.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
+31 20 592 9333 div > ul.footer__contact > li.footer__contact-item > a.footer__contact-link |
info@cwi.nl div > ul.footer__contact > li.footer__contact-item > a.footer__contact-link |
These items highlight common accessibility best practices.