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https://en.wikipedia.org/wiki/Octopus

Accessibility

· 22 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.
SCORE
75
GRADE
C
FIX
6
REVIEW
5
PASS
11
INFO
0
Checks
22
11 PASS 5 REVIEW 6 FIX
F
Alt Text Quality
Action
21 of 57 images have issues
FIX
21 of 57 images have issues
Critical::
21 image(s) missing alt attribute
Images without alt text are invisible to screen readers.
Critical::
21 image-in-link without alt text
An image inside a link with no alt creates an empty link.
Info::
1 decorative image(s) correctly marked
Info::
35 image(s) with good alt text
57 images 35 good alt text 1 decorative 21 missing
IssueCount
missing21 image(s)

Images without alt text are invisible to screen readers.

Why this matters

Each image without alt text is a WCAG 1.1.1 failure — invisible to screen-reader users, lost from Google Image Search.

Learn more ▾

WCAG 2.1 Level A requires text alternatives for non-decorative images. Empty alt='' is fine for decorative; meaningful images need descriptive text. Common fixes: CMS audit + bulk add, build-time linter (alt-text-required ESLint rule), CI gate on Lighthouse a11y score.

Source: WCAG 2.1 SC 1.1.1 / WebAIM Million Report

An image inside a link with no alt creates an empty link.

Why this matters

Image-only links with no alt create empty links — screen-reader users hear 'link' with no destination context.

Learn more ▾

An <a><img></a> with no img alt is the worst-case for accessibility: AT announces the link but can't describe where it goes. Either add alt to the image OR add aria-label to the link.

Source: WCAG 2.1 SC 2.4.4

D
Tabindex Anti-Patterns
Action
0 positive, 10 -1-on-focusable
FIX
0 positive, 10 -1-on-focusable
Info::
tabindex="-1" on naturally-focusable <button>
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-talk-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-subject-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-history-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-watchstar-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-edit-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-ve-edit-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-viewsource-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <button id="p-lang-btn-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
Info::
tabindex="-1" on naturally-focusable <a id="ca-addsection-sticky-header">
tabindex="-1" removes an element from the keyboard tab order. Naturally-focusable elements (links, buttons, form controls) become unreachable for keyboard users. (Common false-positive: hidden honeypot fields. Verify the element is genuinely interactive before removing the tabindex.)
D
Tap Target Adequacy
Action
10 tap target(s) too small or too close together
FIX
10 tap target(s) too small or too close together
Warning::
10 tap target(s) too small or too close to neighbors
WCAG 2.5.5 (Level AAA) requires interactive targets to be at least 44x44 CSS pixels; WCAG 2.5.8 (Level AA, added in 2.2) requires 24x24 minimum. Failing targets cause mis-taps for users with motor impairments, large fingers, or shaky hands -- and are a major bounce-rate driver on mobile commerce flows. Lighthouse measures rendered rects + adjacent-element spacing; the failing list is in the Lighthouse 'tap-targets' audit detail panel.
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
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 ✗
D
Navigation UX
Action
2 navigation pattern(s)
FIX
2 navigation pattern(s)
Info::
Search functionality detected
Got: role-search
Info::
Skip navigation link detected
Info::
17 navigation landmark(s) detected
Breadcrumbs
Search role='search' landmark
Skip Link Skip link detected
Labeled Navigation 17 <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.
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 Not Found ✓Custom Styling ✓Navigation ✓Homepage Link ✓Search Form ✗
C
Favicon & Branding
Action
3 icon(s) detected
REVIEW
3 icon(s) detected
Info::
favicon.ico present at site root
Info::
HTML icon links detected
Info::
Apple touch icon present
✓ favicon.ico Present
✓ PNG Icons Present
✓ Apple Touch Present
✗ SVG Favicon Missing
✗ Manifest Icons Missing
✗ Multiple Sizes Missing
B
Dark Mode Support
Dark mode detected
REVIEW
Dark mode detected
Info::
prefers-color-scheme CSS detected in inline styles
Info::
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 Not set ✗CSS indicators Detected ✓

Detection limited to meta tags and inline styles.

C
Lighthouse Accessibility Audits
Action
Score 79/100 — 7 failing, 25 passed
REVIEW
79

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
Middle Jurassic div > span.noprint > span > a
Pg span.noprint > div#Timeline-row > div > a
Scientific classification tbody > tr > th > a
Synonyms tbody > tr > th > 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
Octopus (disambiguation) div.mw-content-ltr > section#mwAQ > div#mwAw > a.mw-disambig

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
td > figure.mw-halign-none > a.mw-file-description > img.mw-file-element td > figure.mw-halign-none > a.mw-file-description > img.mw-file-element
td > figure.mw-halign-none > a.mw-file-description > img.mw-file-element td > figure.mw-halign-none > a.mw-file-description > img.mw-file-element

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
header.header-container > div.minerva-header > nav.navigation-drawer > input#main-menu-input header.header-container > div.minerva-header > nav.navigation-drawer > input#main-menu-input

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.banner-container > div#siteNotice > div#centralNotice > a#cm2026ref div.banner-container > div#siteNotice > div#centralNotice > a#cm2026ref
tr > td > figure.mw-halign-none > a.mw-file-description tr > td > figure.mw-halign-none > a.mw-file-description
tr > td > figure.mw-halign-none > a.mw-file-description tr > td > figure.mw-halign-none > a.mw-file-description

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

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
Ꞓ span.noprint > div#Timeline-row > div > a
O span.noprint > div#Timeline-row > div > a
S span.noprint > div#Timeline-row > div > a
D span.noprint > div#Timeline-row > div > a
C span.noprint > div#Timeline-row > div > a
P span.noprint > div#Timeline-row > div > a
T span.noprint > div#Timeline-row > div > a
J span.noprint > div#Timeline-row > div > a
Pg span.noprint > div#Timeline-row > div > a
N span.noprint > div#Timeline-row > div > a

These items highlight common accessibility best practices.

Screen readers have features to make navigating tables easier. Ensuring that tables use the actual caption element instead of cells with the `[colspan]` attribute may improve the experience for screen reader users. Learn more about captions.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Octopus Temporal range: Middle Jurassic – recent PreꞒ Ꞓ O S D C P T J K Pg N … div#mw-content-text > div.mw-content-ltr > section#mwAQ > table.infobox
○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
●`[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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●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
●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
●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
○Elements with `role="dialog"` or `role="alertdialog"` have 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
○`<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.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○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.
○`<td>` elements in a large `<table>` have one or more table headers.
A
Landmark Structure
23 landmarks
PASS
23 landmarks
Info::
<main> landmark present
Info::
17 <nav> landmark(s) found
Info::
All <nav> elements are properly labeled
Info::
Skip navigation link present
Warning::
Skip link target(s) don't exist on page: #bodyContent
The skip-link anchor (e.g., `href="#main"`) points at an ID that has no corresponding element on the page. Activating the link does nothing -- a silent WCAG 2.4.1 failure that the visual link presence hides. Add `id="main"` (or whichever matches the href) to the target landmark.
Info::
Search landmark present
Page Structure — as a screen reader sees it
BANNER header NAV "Site" SEARCH MAIN CONTENTINFO footer

The skip-link anchor (e.g., `href="#main"`) points at an ID that has no corresponding element on the page. Activating the link does nothing -- a silent WCAG 2.4.1 failure that the visual link presence hides. Add `id="main"` (or whichever matches the href) to the target landmark.

Why this matters

Skip link points at an ID that doesn't exist on the page. The link looks fine visually but does nothing when activated -- silent WCAG 2.4.1 failure.

Learn more ▾

Find the target landmark (typically <main> or the first <h1>) and add `id="..."` matching the skip link's href fragment. Test by tabbing to the skip link and pressing Enter -- focus should jump to the target.

Source: WCAG 2.1 SC 2.4.1

A+
Heading Hierarchy
34 headings
PASS
34 headings
Info::
Single H1 present
  • H2 Contents
  • H1 Octopus
  • H2 Etymology and pluralisation
  • H2 Anatomy and physiology
  • H3 Size
  • H3 External characteristics
  • H3 Circulatory system
  • H3 Respiration
  • H3 Digestion and excretion
  • H3 Nervous system and senses
  • H3 Ink sac
  • H2 Life cycle
  • H3 Reproduction
  • H3 Lifespan
  • H2 Distribution and habitat
  • H2 Behaviour and ecology
  • H3 Feeding
  • H3 Locomotion
  • H3 Intelligence
  • H3 Camouflage and colour change
  • H3 Defence
  • H3 Pathogens and parasites
  • H2 Evolution
  • H3 Fossil history and phylogeny
  • H3 RNA editing and the genome
  • H2 Relationship to humans
  • H3 Cultural significance
  • H3 Danger to humans
  • H3 As a food source
  • H3 Science and technology
  • H2 See also
  • H2 Notes
  • H2 References
  • H2 External links
A
Form Accessibility
1 of 18 controls have issues
PASS
1 of 18 controls have issues
Warning::
1 control(s) rely on placeholder only
Placeholder text disappears on focus and is not a reliable label.
Got: <input type="search" name="search">
Info::
17 control(s) properly labeled
18 controls
17 labeled
1 placeholder only
0 unlabeled
ControlTypeLabelMethod
#vector-main-menu-dropdown-checkboxcheckboxMain menuaria-label
#searchInputsearchSearch Wikipediaaria-label
#vector-appearance-dropdown-checkboxcheckboxAppearancearia-label
#skin-client-pref-vector-feature-custom-font-size-value-0radioSmallfor/id
#skin-client-pref-vector-feature-custom-font-size-value-1radioStandardfor/id
#skin-client-pref-vector-feature-custom-font-size-value-2radioLargefor/id
#skin-client-pref-vector-feature-limited-width-value-1radioStandardfor/id
#skin-client-pref-vector-feature-limited-width-value-0radioWidefor/id
#skin-client-pref-skin-theme-value-osradioAutomaticfor/id
#skin-client-pref-skin-theme-value-dayradioLightfor/id
#skin-client-pref-skin-theme-value-nightradioDarkfor/id
#vector-user-links-dropdown-checkboxcheckboxPersonal toolsaria-label
#vector-page-titlebar-toc-checkboxcheckboxToggle the table of contentsaria-label
#p-lang-btn-checkboxcheckboxGo to an article in another language. Available in 112 languagesaria-label
#vector-variants-dropdown-checkboxcheckboxChange language variantaria-label
#vector-page-tools-dropdown-checkboxcheckboxToolsaria-label
#vector-sticky-header-toc-checkboxcheckboxToggle the table of contentsaria-label
searchsearch(Search Wikipedia)placeholder only

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

<input type="search" name="search">

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

A+
Form Input Types
18 form control(s) checked, no type mismatches
PASS
18 form control(s) checked, no type mismatches
Info::
No input-type mismatches detected
A+
Form Input Quality
18 form control(s) checked, no input-semantic issues
PASS
18 form control(s) checked, no input-semantic issues
Info::
All form input semantics look correct
A+
Mobile Keyboard & Autofill
No autofill-eligible form controls
PASS
No autofill-eligible form controls
Info::
No autofill-eligible form controls (no name/email/tel/address fields)
A+
Document Language
Lang attribute set to "en"
PASS
Lang attribute set to "en"
Info::
<html lang="en"> is set and valid
Got: en
A+
Iframe Accessibility
No iframes on this page
PASS
No iframes on this page
Info::
No iframes on this page
A+
Mobile-Readable Font Sizes
All 28 visible text node(s) render at >= 12 CSS pixels
PASS
All 28 visible text node(s) render at >= 12 CSS pixels
Info::
All text uses legible mobile font sizes (>= 12 CSS px)
A+
PWA Depth
No PWA depth issues detected
PASS
No PWA depth issues detected
Info::
No PWA depth issues 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
h2 Contents21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Etymology and plural…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Anatomy and physiolo…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Life cycle21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Distribution and hab…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Behaviour and ecolog…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Evolution21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Relationship to huma…21.00:13.0:1
#000000
#FFFFFF
Pass
h2 See also21.00:13.0:1
#000000
#FFFFFF
Pass
h2 Notes21.00:13.0:1
#000000
#FFFFFF
Pass
h2 References21.00:13.0:1
#000000
#FFFFFF
Pass
h2 External links21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Size21.00:13.0:1
#000000
#FFFFFF
Pass
h3 External characteris…21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Circulatory system21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Respiration21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Digestion and excret…21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Nervous system and s…21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Ink sac21.00:13.0:1
#000000
#FFFFFF
Pass
h3 Reproduction21.00:13.0:1
#000000
#FFFFFF
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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