Accessibility

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Checks

2 PASS 3 REVIEW 8 FIX

Landmark Structure

Action

64 landmarks

FIX

64 landmarks

No <main> landmark found

Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.

No <nav> landmark found

No contentinfo (footer) landmark

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

Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.

Why this matters

Without a <main> landmark, screen-reader users can't skip past the navigation to the page content — every page starts with re-reading the menu.

Learn more ▾

The <main> element marks the page's primary content area. Assistive tech offers a 'jump to main' shortcut — but only if <main> exists. Without it, every page navigation forces re-reading the header. Wrap your primary content in a single <main>.

Source: WAI-ARIA / WCAG 2.4.1

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

Link & Button Quality

Action

28 issue(s) across 300 links and 18 buttons

FIX

28 issue(s) across 300 links and 18 buttons

14 link(s) with no accessible text

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

Got: https://bsky.app/profile/esa.int; https://www.facebook.com/EuropeanSpaceAgency; https://www.instagram.com/europeanspaceagency/; https://www.linkedin.com/company/european-space-agency/; https://www.pinterest.com/EuropeanSpaceAgency/; https://twitter.com/esa; https://www.youtube.com/user/ESA; https://bsky.app/profile/esa.int; https://www.facebook.com/EuropeanSpaceAgency; https://www.instagram.com/europeanspaceagency/ (+4 more)

17 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[href="/About_Us/Careers_at_ESA"]; a[href="/About_Us/Business_with_ESA"]; a[href="/Newsroom"]; a[href="/Education"]; a[href="https://www.esa.int/kids"]; a[href="https://shop.esa.int"]; a[href="https://blogs.esa.int/exploration/category/astronauts/sophie-adenot/"]; a[href="https://blogs.esa.int/exploration/category/astronauts/pablo-avarez-fernandez/"]; a[href="https://blogs.esa.int/exploration/category/astronauts/rosemary-coogan/"]; a[href="http://www.esa.int/samanthacristoforetti"] (+7 more)

24 link(s) open in new tab without warning

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

Got: /About_Us/Corporate_news/ESA_ESEC; https://commercialisation.esa.int/; https://brand.esa.int/merchandising/; https://ideas.esa.int/servlet/hype/IMT?userAction=BrowseCurrentUser&templateN…; https://historicalarchives.esa.int; https://www.esa.int/kids; https://brand.esa.int; https://www.sdo.esoc.esa.int/environment_report/Space_Environment_Report_late…; https://blogs.esa.int/rocketscience/2025/02/10/james-webb-space-telescope-wil…; https://commercialisation.esa.int/ (+14 more)

14 button(s) with no accessible text

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

Got: button#esa-menu; button#esa-search; button.quick-search__submit (#41 on page); button.close-menu (#47 on page); button.back-menu (#79 on page); button.back-menu (#260 on page); button.back-menu (#312 on page); button.back-menu (#483 on page); button.back-menu (#596 on page); button.back-menu (#724 on page) (+4 more)

245 link(s) with descriptive text

300 links

14 empty

0 generic text

24 new tab

14 empty buttons

Element	Text	Issue	Suggested Fix
https://bsky.app/profile/esa.int	(empty)	empty	Add link text or aria-label
https://www.facebook.com/EuropeanSpaceAg…	(empty)	empty	Add link text or aria-label
https://www.instagram.com/europeanspacea…	(empty)	empty	Add link text or aria-label
https://www.linkedin.com/company/europea…	(empty)	empty	Add link text or aria-label
https://www.pinterest.com/EuropeanSpaceA…	(empty)	empty	Add link text or aria-label
https://twitter.com/esa	(empty)	empty	Add link text or aria-label
https://www.youtube.com/user/ESA	(empty)	empty	Add link text or aria-label
/About_Us/Careers_at_ESA	Careers	img no alt	Add alt attribute to the image
/About_Us/Business_with_ESA	Business with ESA	img no alt	Add alt attribute to the image
/Newsroom	Newsroom	img no alt	Add alt attribute to the image
/Education	Education	img no alt	Add alt attribute to the image
https://www.esa.int/kids	Kids	new tab	Add '(opens in new tab)' to text
https://shop.esa.int	ESA Space Shop	new tab	Add '(opens in new tab)' to text
/About_Us/Corporate_news/ESA_ESEC	ESA ESEC	new tab	Add '(opens in new tab)' to text
https://commercialisation.esa.int/	ESA Commercialisation Gateway	new tab	Add '(opens in new tab)' to text
https://brand.esa.int/merchandising/	Merchandising Licence	new tab	Add '(opens in new tab)' to text
https://ideas.esa.int/servlet/hype/IMT?u…	Open Space Innovation Platform	new tab	Add '(opens in new tab)' to text
https://historicalarchives.esa.int	ESA Historical Archives	new tab	Add '(opens in new tab)' to text
https://www.esa.int/kids	Kids	new tab	Add '(opens in new tab)' to text
https://brand.esa.int	ESA Brand Centre	new tab	Add '(opens in new tab)' to text
https://blogs.esa.int/exploration/catego…	Sophie Adenot	new tab	Add '(opens in new tab)' to text
https://blogs.esa.int/exploration/catego…	Pablo Álvarez Fernández	new tab	Add '(opens in new tab)' to text
https://blogs.esa.int/exploration/catego…	Rosemary Coogan	new tab	Add '(opens in new tab)' to text
http://www.esa.int/samanthacristoforetti	Samantha Cristoforetti	new tab	Add '(opens in new tab)' to text
http://www.esa.int/alexandergerst	Alexander Gerst	new tab	Add '(opens in new tab)' to text
https://blogs.esa.int/exploration/catego…	Raphaël Liégeois	new tab	Add '(opens in new tab)' to text
http://www.esa.int/matthiasmaurer	Matthias Maurer	new tab	Add '(opens in new tab)' to text
http://www.esa.int/andreasmogensen	Andreas Mogensen	new tab	Add '(opens in new tab)' to text
http://www.esa.int/lucaparmitano	Luca Parmitano	new tab	Add '(opens in new tab)' to text
http://www.esa.int/thomaspesquet	Thomas Pesquet	new tab	Add '(opens in new tab)' to text
https://blogs.esa.int/exploration/catego…	Marco Sieber	new tab	Add '(opens in new tab)' to text
https://www.sdo.esoc.esa.int/environment…	Space Environment Report	new tab	Add '(opens in new tab)' to text
https://blogs.esa.int/rocketscience/2025…	Focus on Spa…	new tab	Add '(opens in new tab)' to text
https://commercialisation.esa.int/	ESA Commercialisation Gateway	new tab	Add '(opens in new tab)' to text
https://ideas.esa.int/servlet/hype/IMT?u…	Open Space Innovation Platform	new tab	Add '(opens in new tab)' to text
https://commercialisation.esa.int/bic/	Business Incubation	new tab	Add '(opens in new tab)' to text
https://spacesolutions.esa.int/	ESA Space Solutions	new tab	Add '(opens in new tab)' to text
https://phiweek.esa.int/	Focus on App…	new tab	Add '(opens in new tab)' to text
http://www.esa.int/gsp/ACT/index.html	Advanced Concepts Team	new tab	Add '(opens in new tab)' to text
/Enabling_Support/Space_Transportation/V…	Vega	new tab	Add '(opens in new tab)' to text
https://blogs.esa.int/rocketscience/2024…	Focus on Ena…	new tab	Add '(opens in new tab)' to text
/About_Us/ESA_Strategy_2040	ESA Strategy 2040	new tab	Add '(opens in new tab)' to text
/About_Us/50_years_of_ESA	50 years of ESA	new tab	Add '(opens in new tab)' to text
https://discover.esa.int/	Focus on Disc…	new tab	Add '(opens in new tab)' to text
http://blogs.esa.int/	Focus on ESA …	new tab	Add '(opens in new tab)' to text
https://brand.esa.int/	Focus on ESA …	new tab	Add '(opens in new tab)' to text
https://ideas.esa.int	Focus on Open…	new tab	Add '(opens in new tab)' to text
https://commercialisation.esa.int/	Focus on ESA …	new tab	Add '(opens in new tab)' to text
https://bsky.app/profile/esa.int	(empty)	empty	Add link text or aria-label
https://www.facebook.com/EuropeanSpaceAg…	(empty)	empty	Add link text or aria-label
https://www.instagram.com/europeanspacea…	(empty)	empty	Add link text or aria-label
https://www.linkedin.com/company/europea…	(empty)	empty	Add link text or aria-label
https://www.pinterest.com/EuropeanSpaceA…	(empty)	empty	Add link text or aria-label
https://twitter.com/esa	(empty)	empty	Add link text or aria-label
https://www.youtube.com/user/ESA	(empty)	empty	Add link 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
<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

249 links and buttons have descriptive text

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

https://bsky.app/profile/esa.int; https://www.facebook.com/EuropeanSpaceAgency; https://www.instagram.com/europeanspaceagency/; https://www.linkedin.com/company/european-space-agency/; https://www.pinterest.com/EuropeanSpaceAgency/; https://twitter.com/esa; https://www.youtube.com/user/ESA; https://bsky.app/profile/esa.int; https://www.facebook.com/EuropeanSpaceAgency; https://www.instagram.com/europeanspaceagency/ (+4 more)

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[href="/About_Us/Careers_at_ESA"]; a[href="/About_Us/Business_with_ESA"]; a[href="/Newsroom"]; a[href="/Education"]; a[href="https://www.esa.int/kids"]; a[href="https://shop.esa.int"]; a[href="https://blogs.esa.int/exploration/category/astronauts/sophie-adenot/"]; a[href="https://blogs.esa.int/exploration/category/astronauts/pablo-avarez-fernandez/"]; a[href="https://blogs.esa.int/exploration/category/astronauts/rosemary-coogan/"]; a[href="http://www.esa.int/samanthacristoforetti"] (+7 more)

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.

/About_Us/Corporate_news/ESA_ESEC; https://commercialisation.esa.int/; https://brand.esa.int/merchandising/; https://ideas.esa.int/servlet/hype/IMT?userAction=BrowseCurrentUser&templateN…; https://historicalarchives.esa.int; https://www.esa.int/kids; https://brand.esa.int; https://www.sdo.esoc.esa.int/environment_report/Space_Environment_Report_late…; https://blogs.esa.int/rocketscience/2025/02/10/james-webb-space-telescope-wil…; https://commercialisation.esa.int/ (+14 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#esa-menu; button#esa-search; button.quick-search__submit (#41 on page); button.close-menu (#47 on page); button.back-menu (#79 on page); button.back-menu (#260 on page); button.back-menu (#312 on page); button.back-menu (#483 on page); button.back-menu (#596 on page); button.back-menu (#724 on page) (+4 more)

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

Favicon & Branding

Action

1 icon(s) detected

FIX

1 icon(s) detected

favicon.ico present at site root

No apple-touch-icon detected

iOS devices use this when users add your site to their home screen. Add <link rel='apple-touch-icon' sizes='180x180' href='/apple-touch-icon.png'>.

✓ favicon.ico Present

✗ PNG Icons Missing

✗ Apple Touch Missing

✗ SVG Favicon Missing

✗ Manifest Icons Missing

✗ Multiple Sizes Missing

Web Manifest

Action

Not found

FIX

Not found

No web manifest found

No manifest at standard paths (/manifest.json, /site.webmanifest). A manifest is optional but enables PWA features like home screen installation and standalone display.

No web manifest found.

Dark Mode Support

Action

No dark mode signals

FIX

No dark mode signals

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 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.

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 ✗

Lighthouse Accessibility Audits

Action

Score 60/100 — 5 failing, 10 passed

FIX

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle `div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle`
div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle `div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle`
div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle `div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle`
div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle `div.wrapper > section#gateway > div.c-gateway__block > button.c-gateway__toggle`

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.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`

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.

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
SCIENCE & EXPLORATION `div.feature-item > figure.thumbnail > header.entry > span.pillar`
AGENCY `a.card > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
21/04/2026 `a.card > header.entry > div.meta > span`
1426 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
APPLICATIONS `div.grid-item > a.card > header.entry > span.pillar`
15/04/2026 `a.card > header.entry > div.meta > span`
1822 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
15/04/2026 `a.card > header.entry > div.meta > span`
7008 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
APPLICATIONS `div.grid-item > a.card > header.entry > span.pillar`
15/04/2026 `a.card > header.entry > div.meta > span`
1573 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
13/04/2026 `a.card > header.entry > div.meta > span`
10039 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
MORE ITEMS `div.grid-item > a.card > div.outline > h3.heading`
ENABLING & SUPPORT `div.feature-item > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `div.feature-item > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
20/04/2026 `a.card > header.entry > div.meta > span`
2852 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
281882 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
21/04/2026 `a.card > header.entry > div.meta > span`
1426 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
31621005 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
AGENCY `div.grid-item > a.card > header.entry > span.pillar`
396879 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
AGENCY `div.grid-item > a.card > header.entry > span.pillar`
1513652 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
13/04/2026 `a.card > header.entry > div.meta > span`
10039 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
02/04/2026 `a.card > header.entry > div.meta > span`
12751 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
APPLICATIONS `div.grid-item > a.card > header.entry > span.pillar`
28/03/2026 `a.card > header.entry > div.meta > span`
2834 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
27/03/2026 `a.card > header.entry > div.meta > span`
114642 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
26/03/2026 `a.card > header.entry > div.meta > span`
1351 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
MORE ITEMS `div.grid-item > a.card > div.outline > h3.heading`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `a.card > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `a.card > figure.thumbnail > header.entry > span.pillar`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
MORE ITEMS `div.grid-item > a.card > div.outline > h3.heading`

These are opportunities to improve the legibility of your content.

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`

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
1 `div.flexslider > ol.flex-control-nav > li > a.flex-active`
2 `div.flexslider > ol.flex-control-nav > li > a`
3 `div.flexslider > ol.flex-control-nav > li > a`
4 `div.flexslider > ol.flex-control-nav > li > a`

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-hidden="true"]` is not present on the document `<body>`

●Image elements have `[alt]` attributes

●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

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

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

○ARIA attributes are used as specified for the element's role

○Deprecated ARIA roles were not used

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted ARIA attributes

○`[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

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

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

○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.

○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.

○`<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.

○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.

Heading Hierarchy

109 headings

REVIEW

109 headings

No H1 heading found

Every page should have one H1 that describes the page content.

H2 About ESA
H3 Highlights
H3 ESA - United space in Europe
H3 Establishments & sites
H3 Working with ESA
H3 More about ESA
H3 Latest
H3 Euclid Space Warps: help spot galaxies bending spacetime
H3 Week in images: 13-17 April 2026
H3 Earth from Space: Land of rainforests
H3 Artemis II: around the Moon in 10 days
H3 Laurent Jaffart appointed Director of Resilience, Navigation and Connectivity
H2 Space in Member States
H2 Science & Exploration
H3 Programmes
H3 Astronauts
H3 Missions
H3 Activities
H3 Latest
H3 Euclid Space Warps: help spot galaxies bending spacetime
H3 Moon joy, Earth love
H3 Plato passes vibe check
H3 ESA 3D prints first metal part on the International Space Station
H3 Space science from home: resources for children and adults
H2 Space Safety
H3 About space safety
H3 Asteroids
H3 Space junk
H3 Safety from space
H3 Space weather
H3 Latest
H3 Flyeye: ESA’s automated asteroid hunters
H3 Hera on course for asteroid rendezvous
H3 Hera mission poster
H3 James Webb Space Telescope will study asteroid 2024 YR4
H2 Applications
H3 Observing the Earth
H3 Connectivity
H3 Satellite navigation
H3 Commercialisation
H3 Latest
H3 Earth from Space: Land of rainforests
H3 Three ESA-built satellites on show in France
H3 ESA’s Space Systems for Safety and Security (4S) programme
H3 Media invitation: Last chance to see the EarthCARE cloud and aerosol satellite in Europe
H3 Register for Φ-week
H2 Enabling & Support
H3 Building missions
H3 Space transportation
H3 Flying missions
H3 Latest
H3 ESA Extended Reality Competence Centre
H3 The perfect place for Celeste’s first navigation signal
H3 Proba-3 lift-off replay
H3 Blog: Juice's lunar-Earth flyby
H3 Call for interest: Ariane 6 launch media events at Europe’s Spaceport
H3 Hubble turns 36 with a dazzling Trifid Nebula portrait
H3 Three ESA-built satellites on show in France
H3 Week in images: 13-17 April 2026
H3 A stellar year for talent: more than 400 job opportunities in 2026
H4 ESA Vision
H4 ESA Pillars
H4 ESA Programmes
H4 ESA and You
H2 In the spotlight
H3 εpsilon
H3 Euclid Space Warps: help spot galaxies bending spacetime
H3 Earth from Space: Land of rainforests
H3 Antarctica’s vanishing sea ice transforms marine life
H3 Ash creeps across Mars
H3 ESA begins next phase of 'fibre in the sky' optical communi…
H3 Artemis II: around the Moon in 10 days
H3 Week in images: 06-10 April 2026
H3 Earth from Space: Lava flow on Réunion Island
H3 More items
H3 Ariane 6 first flight highlights
H2 Recommended
H3 Our missions
H3 Discover ESA
H3 This is ESA
H3 ESA Blog Navigator
H3 ESA Brand Centre
H3 Euclid’s view of the Horsehead Nebula
H2 Trending
H3 Hubble turns 36 with a dazzling Trifid Nebula portrait
H3 Artemis II
H3 Euclid Space Warps: help spot galaxies bending spacetime
H3 Where is the International Space Station?
H3 ESA Academy opportunities
H3 Student Internships
H2 Featured videos
H3 Artemis II: around the Moon in 10 days
H3 Artemis II: Journey to the Moon begins
H3 Launch of ESA’s Celeste mission 1
H3 How Europe will power the journey to the Moon and back
H3 Smile pre-launch media briefing
H3 More items
H2 More
H3 Careers at ESA
H3 Business with ESA
H3 Open Space Innovation Platform
H3 ESA Commercialisation Gateway
H2 Featured images
H3 Earth from Space: Land of rainforests
H3 Earth from Space: Lava flow on Réunion Island
H3 Moon joy, Earth love
H3 A pair of planet-forming discs
H3 Earth from Space: Eyes on our Moon
H3 More items

Every page should have one H1 that describes the page content.

Why this matters

No H1 means screen-reader users can't identify the page's primary topic, and Google's content-extraction degrades.

Learn more ▾

The H1 is the document title for assistive tech and a strong signal to search engines about page topic. Pages without one force screen readers to fall back to the <title> attribute or page chrome. Add a single H1 that names the page's primary subject.

Source: WCAG 2.4.6 / Google Search Central

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

Homepage link present on 404 page

404 Page Quality ✓ Custom 404 Page

Status Code HTTP 404 ✓Page Title ESA - kernel (20) ✓Custom Styling ✓Navigation ✓Homepage Link ✓Search Form ✗

Color Contrast (Screenshot)

Action

20 text elements analyzed, 20 fail WCAG AA

REVIEW

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

0 pass 20 fail WCAG AA

h2 About ESA

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · mid-page

h2 Space in Member States

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · bottom of viewport

h2 In the spotlight

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · bottom of viewport

h2 Recommended

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · bottom of viewport

h2 Trending

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · bottom of viewport

h2 Featured videos

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · bottom of viewport

h2 More

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · bottom of viewport

h2 Featured images

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

24px · bottom of viewport

h3 Highlights

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · mid-page

h3 ESA - United space in Europe

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Establishments & sites

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Working with ESA

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 More about ESA

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Latest

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Euclid Space Warps: help spot galaxies b…

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Week in images: 13-17 April 2026

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Earth from Space: Land of rainforests

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Artemis II: around the Moon in 10 days

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Laurent Jaffart appointed Director of Re…

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

h3 Programmes

1.22:1

#000000

#0B1D26

needs 3.0:1 (large text)

19px · bottom of viewport

Show all checked elements (20)

Element	Ratio	Required	FG	BG	Result
h2 About ESA	1.22:1	3.0:1	#000000	#0B1D26	Fail
h2 Space in Member Stat…	1.22:1	3.0:1	#000000	#0B1D26	Fail
h2 In the spotlight	1.22:1	3.0:1	#000000	#0B1D26	Fail
h2 Recommended	1.22:1	3.0:1	#000000	#0B1D26	Fail
h2 Trending	1.22:1	3.0:1	#000000	#0B1D26	Fail
h2 Featured videos	1.22:1	3.0:1	#000000	#0B1D26	Fail
h2 More	1.22:1	3.0:1	#000000	#0B1D26	Fail
h2 Featured images	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Highlights	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 ESA - United space i…	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Establishments & sit…	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Working with ESA	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 More about ESA	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Latest	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Euclid Space Warps: …	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Week in images: 13-1…	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Earth from Space: La…	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Artemis II: around t…	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Laurent Jaffart appo…	1.22:1	3.0:1	#000000	#0B1D26	Fail
h3 Programmes	1.22:1	3.0:1	#000000	#0B1D26	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+

Alt Text Quality

All 179 images OK

PASS

All 179 images OK

1 image(s) with alt text over 125 characters

42 decorative image(s) correctly marked

136 image(s) with good alt text

179 images 136 good alt text 42 decorative

Issue	Count
too long	1 image(s)

Form Accessibility

1 of 1 controls have issues

PASS

1 of 1 controls have issues

1 control(s) rely on placeholder only

Placeholder text disappears on focus and is not a reliable label.

Got: <input type="text" name="q">

1 controls

0 labeled

1 placeholder only

0 unlabeled

Control	Type	Label	Method
q	text	(Search ESA)	placeholder only

Placeholder text disappears on focus and is not a reliable label.

Why this matters

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

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