Accessibility

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Checks

6 PASS 3 REVIEW 4 FIX

Link & Button Quality

Action

12 issue(s) across 89 links and 30 buttons

FIX

12 issue(s) across 89 links and 30 buttons

4 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="https://srv.carbonads.net/ads/click/x/GTND427UCYSIL2QYC6B4YKQUCASI6KQ7F6SIKZ3…"]; a[href="/docs/5.3/getting-started/webpack/"]; a[href="/docs/5.3/getting-started/parcel/"]; a[href="/docs/5.3/getting-started/vite/"]

21 link(s) open in new tab without warning

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

Got: https://icons.getbootstrap.com/; https://blog.getbootstrap.com/; https://github.com/twbs; https://x.com/getbootstrap; https://opencollective.com/bootstrap; https://www.herodevs.com/support/nes-bootstrap?utm_source=Bootstrap_site&utm_…; https://srv.carbonads.net/ads/click/x/GTND427UCYSIL2QYC6B4YKQUCASI6KQ7F6SIKZ3…; http://carbonads.net/?utm_source=getbootstrapcom&utm_medium=ad_via_link&utm_c…; https://github.com/twbs/bootstrap/blob/main/LICENSE; https://creativecommons.org/licenses/by/3.0/ (+11 more)

12 button(s) with no accessible text

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

Got: button.btn-clipboard (#234 on page); button.btn-clipboard (#283 on page); button.btn-clipboard (#294 on page); button.btn-clipboard (#317 on page); button.btn-clipboard (#349 on page); button.btn-clipboard (#408 on page); button.btn-clipboard (#440 on page); button.btn-clipboard (#523 on page); button.btn-clipboard (#567 on page); button.btn-clipboard (#647 on page) (+2 more)

64 link(s) with descriptive text

89 links

0 empty

0 generic text

21 new tab

12 empty buttons

Element	Text	Issue	Suggested Fix
https://icons.getbootstrap.com/	Icons	new tab	Add '(opens in new tab)' to text
https://blog.getbootstrap.com/	Blog	new tab	Add '(opens in new tab)' to text
https://github.com/twbs	GitHub GitHub	new tab	Add '(opens in new tab)' to text
https://x.com/getbootstrap	X X	new tab	Add '(opens in new tab)' to text
https://opencollective.com/bootstrap	Open Collective Open Collec…	new tab	Add '(opens in new tab)' to text
https://www.herodevs.com/support/nes-boo…	Get Security Updates for Boots…	new tab	Add '(opens in new tab)' to text
https://srv.carbonads.net/ads/click/x/GT…	ads via Carbon	new tab	Add '(opens in new tab)' to text
https://srv.carbonads.net/ads/click/x/GT…	Start 14-day free trial Free…	new tab	Add '(opens in new tab)' to text
http://carbonads.net/?utm_source=getboot…	ads via Carbon	new tab	Add '(opens in new tab)' to text
/docs/5.3/getting-started/webpack/	Webpack	img no alt	Add alt attribute to the image
/docs/5.3/getting-started/parcel/	Parcel	img no alt	Add alt attribute to the image
/docs/5.3/getting-started/vite/	Vite	img no alt	Add alt attribute to the image
https://github.com/twbs/bootstrap/blob/m…	MIT	new tab	Add '(opens in new tab)' to text
https://creativecommons.org/licenses/by/…	CC BY 3.0	new tab	Add '(opens in new tab)' to text
https://cottonbureau.com/people/bootstra…	Swag Store	new tab	Add '(opens in new tab)' to text
https://github.com/twbs/bootstrap	Bootstrap 5	new tab	Add '(opens in new tab)' to text
https://github.com/twbs/bootstrap/tree/v…	Bootstrap 4	new tab	Add '(opens in new tab)' to text
https://github.com/twbs/icons	Icons	new tab	Add '(opens in new tab)' to text
https://github.com/twbs/rfs	RFS	new tab	Add '(opens in new tab)' to text
https://github.com/twbs/examples	Examples repo	new tab	Add '(opens in new tab)' to text
https://github.com/twbs/bootstrap/issues	Issues	new tab	Add '(opens in new tab)' to text
https://github.com/twbs/bootstrap/discus…	Discussions	new tab	Add '(opens in new tab)' to text
https://github.com/sponsors/twbs	Corporate sponsors	new tab	Add '(opens in new tab)' to text
https://opencollective.com/bootstrap	Open Collective	new tab	Add '(opens in new tab)' to text
https://stackoverflow.com/questions/tagg…	Stack Overflow	new tab	Add '(opens in new tab)' to text
<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

82 links and buttons have descriptive text

Image-only links need alt text on the image (or aria-label on the link) so screen readers can announce them.

a[href="https://srv.carbonads.net/ads/click/x/GTND427UCYSIL2QYC6B4YKQUCASI6KQ7F6SIKZ3…"]; a[href="/docs/5.3/getting-started/webpack/"]; a[href="/docs/5.3/getting-started/parcel/"]; a[href="/docs/5.3/getting-started/vite/"]

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.

https://icons.getbootstrap.com/; https://blog.getbootstrap.com/; https://github.com/twbs; https://x.com/getbootstrap; https://opencollective.com/bootstrap; https://www.herodevs.com/support/nes-bootstrap?utm_source=Bootstrap_site&utm_…; https://srv.carbonads.net/ads/click/x/GTND427UCYSIL2QYC6B4YKQUCASI6KQ7F6SIKZ3…; http://carbonads.net/?utm_source=getbootstrapcom&utm_medium=ad_via_link&utm_c…; https://github.com/twbs/bootstrap/blob/main/LICENSE; https://creativecommons.org/licenses/by/3.0/ (+11 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.btn-clipboard (#234 on page); button.btn-clipboard (#283 on page); button.btn-clipboard (#294 on page); button.btn-clipboard (#317 on page); button.btn-clipboard (#349 on page); button.btn-clipboard (#408 on page); button.btn-clipboard (#440 on page); button.btn-clipboard (#523 on page); button.btn-clipboard (#567 on page); button.btn-clipboard (#647 on page) (+2 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

Dark Mode Support

Action

Theme color only

FIX

Theme color only

Theme-color present but no dark variant

A theme-color is set but no dark-specific variant was found. The browser toolbar may not adapt for dark mode users.

Got: #712cf9

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 ModePartial Dark Mode

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 ✗

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 Bootstrap ✓Custom Styling ✓Navigation ✓Homepage Link ✓Search Form ✗

Favicon & Branding

7 icon(s) detected

REVIEW

7 icon(s) detected

favicon.ico present at site root

HTML icon links detected

Apple touch icon present

Multiple icon sizes detected

✓ favicon.ico Present

✓ PNG Icons Present

✓ Apple Touch Present

✗ SVG Favicon Missing

✓ Manifest Icons Present

✓ Multiple Sizes Present

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

title Bootstrap · The most popular HTML, CSS,…

3.47:1

#000000

#722EF9

needs 4.5:1 (normal text)

16px · top of page (header area)

a Skip to main content

3.60:1

#000000

#7533F9

needs 4.5:1 (normal text)

16px · top of page (header area)

Show all checked elements (20)

Element	Ratio	Required	FG	BG	Result
h1 Build fast, responsi…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h2 Get started any way …	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h2 Customize everything…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h2 Build and extend in …	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h2 Components, meet the…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h2 Powerful JavaScript …	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h2 Personalize it with …	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Install via package …	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Include via CDN	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Include all of Boots…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Include what you nee…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Using CSS variables	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Customizing via CSS …	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Quickly customize co…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Create and extend ut…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Data attribute API	20.26:1	3.0:1	#000000	#FCFAFF	Pass
h3 Comprehensive set of…	20.26:1	3.0:1	#000000	#FCFAFF	Pass
title Bootstrap · The mos…	3.47:1	4.5:1	#000000	#722EF9	Fail
a Skip to main content	3.60:1	4.5:1	#000000	#7533F9	Fail
span Search	17.50:1	4.5:1	#000000	#F8EABE	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+

Landmark Structure

4 landmarks

PASS

4 landmarks

<main> landmark present

1 <nav> landmark(s) found

Skip navigation link present

Page Structure — as a screen reader sees it

Heading Hierarchy

37 headings, 1 skip(s)

PASS

37 headings, 1 skip(s)

Single H1 present

Heading level skipped: H2 → H5 (missing H3)

Skipping heading levels breaks the document outline. Screen readers may interpret missing levels as structural errors.

H5 Bootstrap
H6 v5 releases
H6 Previous releases
H1 Build fast, responsive sites with Bootstrap
H2 Get started any way you want
H3 Install via package manager
H3 Include via CDN
H4 Read our getting started guides
H2 Customize everything with Sass
H3 Include all of Bootstrap’s Sass
H3 Include what you need
H2 Build and extend in real-time with CSS variables
H3 Using CSS variables
H3 Customizing via CSS variables
H2 Components, meet the Utility API
H3 Quickly customize components
H3 Create and extend utilities
H2 Powerful JavaScript plugins without jQuery
H3 Data attribute API
H3 Comprehensive set of plugins
H4 Alert
H4 Button
H4 Carousel
H4 Collapse
H4 Dropdown
H4 Modal
H4 Offcanvas
H4 Popover
H4 Scrollspy
H4 Tab
H4 Toast
H4 Tooltip
H2 Personalize it with Bootstrap Icons
H5 Links skipped
H5 Guides
H5 Projects
H5 Community

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

A+

Alt Text Quality

All 7 images OK

PASS

All 7 images OK

4 decorative image(s) correctly marked

3 image(s) with good alt text

7 images 3 good alt text 4 decorative

All images have appropriate alt text.

A+

Form Accessibility

No form controls

PASS

No form controls

No form controls on this page

No form controls found.

A+

Web Manifest

PWA-ready

PASS

PWA-ready

Meets PWA install criteria

Name present: Bootstrap

192x192 icon present

512x512 icon present

Display mode: standalone

PWA Install Criteria ✓ Installable

Name Bootstrap ✓192×192 icon ✓512×512 icon ✓Start URL /?utm_source=a2hs ✓Display Mode standalone ✓

Name Bootstrap Display Mode standalone Theme Color #7952b3 Background Color #7952b3 Icons 2 icon(s)

Lighthouse Accessibility Audits

Score 92/100 — 4 failing, 25 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.

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
Profile `div.p-4 > ul#pillNav2 > li.nav-item > button#profile-tab2`
Contact `div.p-4 > ul#pillNav2 > li.nav-item > button#contact-tab2`

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
Bootstrap team `div.col-lg-3 > ul.list-unstyled > li.mb-2 > a`
our contributors `div.col-lg-3 > ul.list-unstyled > li.mb-2 > a`
MIT `div.col-lg-3 > ul.list-unstyled > li.mb-2 > a`
CC BY 3.0 `div.col-lg-3 > ul.list-unstyled > li.mb-2 > a`

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Links `div.container > div.row > div.col-6 > h5`

These are opportunities to improve keyboard navigation in your application.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Bootstrap `div.container > div.row > div.col-lg-3 > a.d-inline-flex`

○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

●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

●`[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.

●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

●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.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○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 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

○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.

○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.

○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.