Accessibility

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Checks

7 PASS 4 REVIEW 2 FIX

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 ✗

Navigation UX

Action

1 navigation pattern(s)

FIX

1 navigation pattern(s)

Back-to-top link detected

1 navigation landmark(s) detected

Hamburger menu detected (responsive design)

No breadcrumbs, search, or skip link detected

These navigation aids help users orient themselves and find content efficiently, especially on large sites.

Breadcrumbs

Skip Link

Labeled Navigation 1 <nav> element(s)

Hamburger Menu

Sticky Navigation Cannot reliably detect (CSS-based)

3 of 6 testable patterns navigation patterns detected. Strong navigation UX with multiple discovery paths.

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 Not Found | Nix & NixOS ✓Custom Styling ✓Navigation ✓Homepage Link ✓Search Form ✗

Web Manifest

Valid manifest

REVIEW

Valid manifest

Name present: Nix & NixOS

192x192 icon present

512x512 icon present

PWA Install Criteria Not Installable

Name Nix & NixOS ✓192×192 icon ✓512×512 icon ✓Start URL / ✓Display Mode ✗

Name Nix & NixOS Theme Color #fff Background Color #fff Icons 2 icon(s)

Dark Mode Support

Dark mode detected

REVIEW

Dark mode detected

Dark-specific theme-color detected

A theme-color with media='(prefers-color-scheme: dark)' adapts the browser toolbar for dark mode.

prefers-color-scheme CSS detected in inline styles

Detection limited to meta tags and inline styles

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

Dark Mode✓ Dark Mode Supported

color-scheme meta Not set ✗Dark theme-color #fff ✓CSS indicators Detected ✓

Detection limited to meta tags and inline styles.

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 13 pass AA only

h1 Declarative builds

2.80:1

#000000

#3B5487

needs 3.0:1 (large text)

32px · above the fold

h1 and deployments.

2.80:1

#000000

#3B5487

needs 3.0:1 (large text)

32px · mid-page

Show all checked elements (20)

Element	Ratio	Required	FG	BG	Result
h1 Declarative builds	2.80:1	3.0:1	#000000	#3B5487	Fail
h1 and deployments.	2.80:1	3.0:1	#000000	#3B5487	Fail
h2 Choose from over 120…	3.46:1	3.0:1	#000000	#4B6291	Pass
h2 Examples	3.46:1	3.0:1	#000000	#4B6291	Pass
h2 Footer	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Try new tools withou…	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Multiple languages, …	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Declarative dev-envi…	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Minimal docker image…	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Declarative cloud im…	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Test your configurat…	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 The Project	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Get in Touch	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Contribute	3.46:1	3.0:1	#000000	#4B6291	Pass
h3 Stay up to Date	3.46:1	3.0:1	#000000	#4B6291	Pass
title Nix & NixOS \| Declar…	21.00:1	4.5:1	#000000	#FFFFFF	Pass
a Explore	21.00:1	4.5:1	#000000	#FFFFFF	Pass
a Download	18.37:1	4.5:1	#000000	#ECF0F7	Pass
a Learn	18.18:1	4.5:1	#000000	#E8EFFC	Pass
a Governance	18.18:1	4.5:1	#000000	#E8EFFC	Pass

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

4 landmarks

PASS

4 landmarks

<main> landmark present

1 <nav> landmark(s) found

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

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+

Heading Hierarchy

15 headings

PASS

15 headings

Single H1 present

H1 Declarative builds and deployments.
H2 Choose from over 120 000 Packages
H2 Examples
H3 Try new tools without fear
H3 Multiple languages, one tool
H3 Declarative dev-environments
H3 Minimal docker images
H3 Declarative cloud images
H3 Test your configurations
H2 Footer
H3 The Project
H3 Get in Touch
H3 Contribute
H3 Stay up to Date
H4 Connect with us:

A+

Alt Text Quality

All 2 images OK

PASS

All 2 images OK

2 image(s) with good alt text

2 images 2 good alt text

All images have appropriate alt text.

A+

Form Accessibility

All 1 controls labeled

PASS

All 1 controls labeled

1 control(s) properly labeled

1 controls

1 labeled

0 placeholder only

0 unlabeled

Control	Type	Label	Method
query	text	Search NixOS Packages and Options	none

Link & Button Quality

44 links, 2 buttons — all OK

PASS

44 links, 2 buttons — all OK

14 link(s) open in new tab without warning

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

Got: https://status.nixos.org/; https://search.nixos.org/packages; https://search.nixos.org/options; https://reproducible.nixos.org/; https://github.com/ngi-nix/summer-of-nix; https://discourse.nixos.org/; https://matrix.to/#/#space:nixos.org; https://nix.dev/contributing/how-to-contribute; https://weekly.nixos.org/; https://github.com/NixOS/nixos-homepage/blob/main/LICENSES/CC-BY-SA-4.0.txt (+4 more)

30 link(s) with descriptive text

44 links

0 empty

0 generic text

14 new tab

0 empty buttons

Element	Text	Issue	Suggested Fix
https://status.nixos.org/	Channel Status	new tab	Add '(opens in new tab)' to text
https://search.nixos.org/packages	Packages search	new tab	Add '(opens in new tab)' to text
https://search.nixos.org/options	Options search	new tab	Add '(opens in new tab)' to text
https://reproducible.nixos.org/	Reproducible Builds Status	new tab	Add '(opens in new tab)' to text
https://github.com/ngi-nix/summer-of-nix	Summer of Nix	new tab	Add '(opens in new tab)' to text
https://discourse.nixos.org/	Forum	new tab	Add '(opens in new tab)' to text
https://matrix.to/#/#space:nixos.org	Matrix Chat	new tab	Add '(opens in new tab)' to text
https://nix.dev/contributing/how-to-cont…	Contributing Guide	new tab	Add '(opens in new tab)' to text
https://weekly.nixos.org/	NixOS Weekly (Archive)	new tab	Add '(opens in new tab)' to text
https://github.com/NixOS/nixos-homepage/…	CC-BY-SA-4.0	new tab	Add '(opens in new tab)' to text
https://chaos.social/@nixos_org	Connect with us on Mastodon	new tab	Add '(opens in new tab)' to text
https://x.com/nixos_org	Connect with us on X	new tab	Add '(opens in new tab)' to text
https://www.youtube.com/channel/UC3vIimi…	Connect with us on Youtube	new tab	Add '(opens in new tab)' to text
https://github.com/NixOS	Connect with us on GitHub	new tab	Add '(opens in new tab)' to text

32 links and buttons have descriptive text

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

https://status.nixos.org/; https://search.nixos.org/packages; https://search.nixos.org/options; https://reproducible.nixos.org/; https://github.com/ngi-nix/summer-of-nix; https://discourse.nixos.org/; https://matrix.to/#/#space:nixos.org; https://nix.dev/contributing/how-to-contribute; https://weekly.nixos.org/; https://github.com/NixOS/nixos-homepage/blob/main/LICENSES/CC-BY-SA-4.0.txt (+4 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

Favicon & Branding

10 icon(s) detected

PASS

10 icon(s) detected

favicon.ico present at site root

HTML icon links detected

Apple touch icon present

SVG favicon detected — scales perfectly to any size

Multiple icon sizes detected

✓ favicon.ico Present

✓ PNG Icons Present

✓ Apple Touch Present

✓ SVG Favicon Present

✓ Manifest Icons Present

✓ Multiple Sizes Present

A+

Lighthouse Accessibility Audits

Score 97/100 — 1 failing, 27 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

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
00:00 `div.ap-wrapper > div.ap-player > div.ap-control-bar > span.ap-timer`
00:00 `div.ap-wrapper > div.ap-player > div.ap-control-bar > span.ap-timer`
00:00 `div.ap-wrapper > div.ap-player > div.ap-control-bar > span.ap-timer`
00:00 `div.ap-wrapper > div.ap-player > div.ap-control-bar > span.ap-timer`
00:00 `div.ap-wrapper > div.ap-player > div.ap-control-bar > span.ap-timer`
00:00 `div.ap-wrapper > div.ap-player > div.ap-control-bar > span.ap-timer`
00:00 `div.ap-wrapper > div.ap-player > div.ap-control-bar > span.ap-timer`

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

●`[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.

●`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

●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.

●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

○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

○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.

○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.

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