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Accessibility

· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.
SCORE
64
GRADE
D
FIX
4
REVIEW
5
PASS
4
INFO
0
Checks
13
4 PASS 5 REVIEW 4 FIX
D
Web Manifest
Action
Not found
FIX
Not found
Info::
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.

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
Print Stylesheet
Action
No print styles
FIX
No print styles
Info::
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 ✗
F
Navigation UX
Action
No navigation patterns
FIX
No navigation patterns
Info::
1 navigation landmark(s) detected
Info::
No breadcrumbs, search, or skip link detected
These navigation aids help users orient themselves and find content efficiently, especially on large sites.
Breadcrumbs
Search
Skip Link
Labeled Navigation 1 <nav> element(s)
Back to Top
Hamburger Menu
Sticky Navigation Cannot reliably detect (CSS-based)
1 of 6 testable patterns navigation patterns detected. Limited navigation support. Consider adding breadcrumbs, search, and skip link.
C
Landmark Structure
Action
3 landmarks
REVIEW
3 landmarks
Critical::
No <main> landmark found
Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.
Info::
1 <nav> landmark(s) found
Warning::
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
BANNER header NAV MAIN (missing!) CONTENTINFO footer

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

B
Heading Hierarchy
21 headings
REVIEW
21 headings
Critical::
No H1 heading found
Every page should have one H1 that describes the page content.
  • H2 JupyterLab: A Next-Generation Notebook Interface
  • H2 Jupyter Notebook: The Classic Notebook Interface
  • H3 Language of choice
  • H3 Share notebooks
  • H3 Interactive output
  • H3 Big data integration
  • H3 Pluggable authentication
  • H3 Centralized deployment
  • H3 Container friendly
  • H3 Code meets data
  • H2 Voilà: Share your results
  • H3 Currently in use at
  • H2 Open Standards for Interactive Computing
  • H3 Notebook Document Format
  • H3 Interactive Computing Protocol
  • H3 The Kernel
  • H2 Project Jupyter
  • H2 Subprojects
  • H2 Follow us
  • H2 Legal
  • H2 Subscribe for updates, event info, webinars, and the latest community news

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

B
404 Error Page
HTTP 404, custom page
REVIEW
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
404 Page Quality ✓ Custom 404 Page
Status Code HTTP 404 ✓Page Title Page not found · GitHub Pages ✓Custom Styling ✓Navigation ✓Homepage Link ✓Search Form ✗
B
Favicon & Branding
7 icon(s) detected
REVIEW
7 icon(s) detected
Info::
favicon.ico present at site root
Info::
HTML icon links detected
Info::
Apple touch icon present
Info::
Multiple icon sizes detected
✓ favicon.ico Present
✓ PNG Icons Present
✓ Apple Touch Present
✗ SVG Favicon Missing
✗ Manifest Icons Missing
✓ Multiple Sizes Present
B
Lighthouse Accessibility Audits
Score 85/100 — 4 failing, 19 passed
REVIEW
85

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Privacy Policy div.legal-consent-container > div.hs-richtext > p > a

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Jupyter Notebook Viewer section.featurelist > div.feature > p > a

These are opportunities to improve the legibility of your content.

Names and labels

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Country* Afghanistan Åland Islands Albania Algeria American Samoa Andorra Angol… form#hsForm_3a79d744-5260-4a98-b069-39defccc8f42 > div.hs_country_dropdown > div.input > select#country_dropdown-3a79d744-5260-4a98-b069-39defccc8f42

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.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

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-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Input buttons have discernible text.
●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.
●ARIA attributes are used as specified for the element's role
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●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
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○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
○`[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
○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 type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○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.
○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.
A+
Alt Text Quality
All 50 images OK
PASS
All 50 images OK
Info::
50 image(s) with good alt text
50 images 50 good alt text
All images have appropriate alt text.
A+
Form Accessibility
No form controls
PASS
No form controls
Info::
No form controls on this page
No form controls found.
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
h2 JupyterLab: A Next-G…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Jupyter Notebook: Th…19.26:13.0:1
#000000
#F5F5F5
Pass
h2 Voilà: Share your r…19.26:13.0:1
#000000
#F5F5F5
Pass
h2 Open Standards for I…19.26:13.0:1
#000000
#F5F5F5
Pass
h2 Project Jupyter19.26:13.0:1
#000000
#F5F5F5
Pass
h2 Subprojects19.26:13.0:1
#000000
#F5F5F5
Pass
h2 Follow us19.26:13.0:1
#000000
#F5F5F5
Pass
h2 Legal19.26:13.0:1
#000000
#F5F5F5
Pass
h2 Subscribe for update…19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Language of choice19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Share notebooks19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Interactive output19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Big data integration19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Pluggable authentica…19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Centralized deployme…19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Container friendly19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Code meets data19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Currently in use at19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Notebook Document Fo…19.26:13.0:1
#000000
#F5F5F5
Pass
h3 Interactive Computin…19.26:13.0:1
#000000
#F5F5F5
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.

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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