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Accessibility

· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.
SCORE
75
GRADE
C
FIX
2
REVIEW
4
PASS
7
INFO
0
Checks
13
7 PASS 4 REVIEW 2 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
Navigation UX
Action
2 navigation pattern(s)
FIX
2 navigation pattern(s)
Info::
Skip navigation link detected
Info::
Back-to-top link detected
Info::
5 navigation landmark(s) detected
Breadcrumbs
Search
Skip Link Skip link detected
Labeled Navigation 5 <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.
C
Heading Hierarchy
Action
45 headings, 1 skip(s)
REVIEW
45 headings, 1 skip(s)
Warning::
Multiple H1 headings (2 found)
A page should have only one H1. Multiple H1s dilute the document outline.
Warning::
Heading level skipped: H1 → H4 (missing H2)
Skipping heading levels breaks the document outline. Screen readers may interpret missing levels as structural errors.
Warning::
2 empty heading(s)
Empty headings appear in the document outline but provide no information.
  • H1 A CTO’s guide to real-time Linux
  • H2 Understanding real-time systems, their use cases and inner workings.
  • H1 Validate your open source skills duplicate H1
  • H4 私たちの日本のウェブサイトを試してみてください › skipped
  • H4 嗨！你知道我们有中文站吗？立即带我去！ ›
  • H2 Modern enterprise open source
  • H2 Latest news from our blog ›
  • H3 Intentional leadership at Canonical
  • H3 Ubuntu Pro comes to Nutanix bare-metal Kubernetes
  • H3 RISC-V 101 – what is it and what does it mean for Canonical?
  • H3 What’s new in security for Ubuntu 26.04 LTS?
  • H3 (empty)
  • H3 (empty)
  • H2 Energize your engineers
  • H2 Open source security
  • H2 Significant enterprise savings
  • H2 Public cloud optimization
  • H2 Multi-cloud Kubernetes and containers
  • H2 Carrier–grade private cloud
  • H2 Ultra secure things
  • H2 Workstations and desktops
  • H2 Data center automation
  • H2 Smart robots of all shapes and sizes
  • H2 Multi–cloud applications – beyond PAAS
  • H3 The Ubuntu experts
  • H3 Your comments
  • H2 OpenStack OpenStack
  • H2 Ceph Ceph
  • H2 Kubernetes Kubernetes
  • H2 Managed infrastructure Managed infrastructure
  • H2 AI / ML AI / ML
  • H2 Robotics Robotics
  • H2 IoT IoT
  • H2 Ubuntu Core Ubuntu Core
  • H2 Ubuntu Desktop Ubuntu Desktop
  • H2 Ubuntu Server Ubuntu Server
  • H2 Cloud Cloud
  • H2 Security Security
  • H2 Landscape Landscape
  • H2 Containers Containers
  • H2 Downloads Downloads
  • H2 Support Support
  • H2 Pricing Pricing
  • H2 Sectors
  • H2 Your tracker settings

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

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

Empty headings appear in the document outline but provide no information.

Why this matters

Empty <hN> tags break the document outline — screen-reader users navigating by heading hit dead silence.

Source: WCAG 2.4.6

C
Favicon & Branding
Action
6 icon(s) detected
REVIEW
6 icon(s) detected
Warning::
No favicon.ico at site root
Some older browsers, bookmark tools, and RSS readers look for /favicon.ico. Add one as a fallback.
Info::
HTML icon links detected
Info::
Apple touch icon present
Info::
Multiple icon sizes detected
✗ favicon.ico Missing
✓ PNG Icons Present
✓ Apple Touch Present
✗ SVG Favicon Missing
✓ Manifest Icons Present
✓ Multiple Sizes Present
B
Web Manifest
Valid manifest
REVIEW
Valid manifest
Info::
Name present: Canonical Ubuntu
Info::
192x192 icon present
Info::
512x512 icon present
Info::
Display mode: standalone
PWA Install Criteria Not Installable
Name Canonical Ubuntu ✓192×192 icon ✓512×512 icon ✓Start URL ✗Display Mode standalone ✓
Name Canonical Ubuntu Display Mode standalone Theme Color #ffffff Background Color #ffffff Icons 2 icon(s)
A
Landmark Structure
10 landmarks
PASS
10 landmarks
Info::
<main> landmark present
Info::
5 <nav> landmark(s) found
Warning::
2 of 5 <nav> elements are unlabeled
Multiple navigations need aria-label to distinguish them for screen readers.
Info::
Skip navigation link present
Page Structure — as a screen reader sees it
BANNER header NAV MAIN CONTENTINFO footer

Multiple navigations need aria-label to distinguish them for screen readers.

Why this matters

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+
Alt Text Quality
All 72 images OK
PASS
All 72 images OK
Info::
22 decorative image(s) correctly marked
Info::
50 image(s) with good alt text
72 images 50 good alt text 22 decorative
All images have appropriate alt text.
A+
Form Accessibility
All 50 controls labeled
PASS
All 50 controls labeled
Info::
50 control(s) properly labeled
50 controls
50 labeled
0 placeholder only
0 unlabeled
ControlTypeLabelMethod
#searchsearchSearch our sitesaria-label
qsearchSearch our sitesaria-label
#about-your-projecttextareaTell us about your projectaria-label
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
inputcheckboxnone
#desktop-workstationcheckboxnone
#physical-servercheckboxnone
#public-cloudcheckboxnone
#virtual-machinecheckboxnone
#iot-edge-devicecheckboxnone
#less-5-machinesradionone
#5-to-15-machinesradionone
#15-to-50-machinesradionone
#50-to-100-machinesradionone
#greater-than-100radionone
#ubuntu-repositoriescheckboxnone
#github-upstreamcheckboxnone
#internally-approved-repositorycheckboxnone
#i-dont-know-how-i-consume-osscheckboxnone
#pcicheckboxnone
#hipaacheckboxnone
#fismacheckboxnone
#fips-140checkboxnone
#ncsccheckboxnone
#disa-stigcheckboxnone
#fedrampcheckboxnone
#cis-benchmarkcheckboxnone
#individual-developerscheckboxnone
#project-teamcheckboxnone
#third-party-vendorcheckboxnone
#i-dont-know-tracking-responsibilitycheckboxnone
#advicetextareaWhat advice are you looking for?aria-label
#firstNametextFirst name:for/id
#lastNametextLast name:for/id
#emailemailEmail:for/id
#companytextCompany:for/id
#titletextJob Title:for/id
#countryselectCountry:for/id
inputtextSearcharia-label
#phonetelMobile/cell phone number:for/id
canonicalUpdatesOptIncheckboxnone
#Comments_from_lead__ctextareaYour commentsnone
A
404 Error Page
HTTP 404, custom page
PASS
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::
Homepage link present on 404 page
Info::
Search form present on 404 page
404 Page Quality ✓ Custom 404 Page
Status Code HTTP 404 ✓Page Title 404: Page not found | Ubuntu ✓Custom Styling ✓Navigation ✓Homepage Link ✓Search Form ✓
A+
Print Stylesheet
Print styles detected
PASS
Print styles detected
Info::
External print stylesheet detected
Got: /static/css/print.css?v=b63170c
Print Stylesheet ✓ Print Optimized
Print stylesheet /static/css/print.css?v=b63170c ✓Inline @media print Not detected ✗
A+
Color Contrast (Screenshot)
20 text elements analyzed, 0 fail WCAG AA
PASS

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

20 pass
Show all checked elements (20)
ElementRatioRequiredFGBGResult
h1 A CTO’s guide to r…6.84:13.0:1
#000000
#939393
Pass
h1 Validate your open s…6.84:13.0:1
#000000
#939393
Pass
h2 Understanding real-t…6.84:13.0:1
#000000
#939393
Pass
h2 Modern enterprise op…6.84:13.0:1
#000000
#939393
Pass
h2 Latest news from6.84:13.0:1
#000000
#939393
Pass
h2 Energize your engine…6.84:13.0:1
#000000
#939393
Pass
h2 Open source security6.84:13.0:1
#000000
#939393
Pass
h2 Significant enterpri…6.84:13.0:1
#000000
#939393
Pass
h2 Public cloud optimiz…6.84:13.0:1
#000000
#939393
Pass
h2 Multi-cloud Kubernet…6.84:13.0:1
#000000
#939393
Pass
h2 Carrier–grade priv…6.84:13.0:1
#000000
#939393
Pass
h2 Ultra secure things6.84:13.0:1
#000000
#939393
Pass
h2 Workstations and des…6.84:13.0:1
#000000
#939393
Pass
h2 Data center automati…6.84:13.0:1
#000000
#939393
Pass
h2 Smart robots of all …6.84:13.0:1
#000000
#939393
Pass
h2 Multi–cloud applic…6.84:13.0:1
#000000
#939393
Pass
h2 Sectors6.84:13.0:1
#000000
#939393
Pass
h2 Your tracker setting…6.84:13.0:1
#000000
#939393
Pass
h3 The Ubuntu experts6.84:13.0:1
#000000
#939393
Pass
h3 Your comments6.84:13.0:1
#000000
#939393
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.

A+
Lighthouse Accessibility Audits
Score 100/100 — 0 failing, 32 passed
PASS
100

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.

○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
●`[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
●`button`, `link`, and `menuitem` elements have accessible names
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[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
●`<frame>` or `<iframe>` elements have a title
●`<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
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○ARIA input fields 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
○`<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.
○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.
○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.

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