Making accessibility standards easy to understand, one success criterion at a time.

WCAG version: 2.1

Collection of success criterion published in WCAG version 2.1 in 2018. Notably adds mobile, low vision, and cognitive updates.

WCAG 2.0, 2.1, 2.2 Level AAA

2.3.2 Three Flashes

Flashing content must never exceed three flashes per second, without exceptions.

Sensory
Cognitive, Visual
Content, Design
WCAG 2.1, 2.2 Level AAA

2.3.3 Animation from Interactions

Animations triggered by interactions like button presses can be turned off.

Sensory
Cognitive, Visual
Code, Design
WCAG 2.0, 2.1, 2.2 Level A

2.4.1 Bypass Blocks

‘Skip links’ are available for keyboard users to jump past navigation.

Keyboard
Cognitive, Physical/Motor, Visual
Code, Design
WCAG 2.0, 2.1, 2.2 Level AAA

2.4.10 Section Headings

Headings are used to group distinct sections on a page.

Code and Labels
Cognitive, Visual
Content, Design
WCAG 2.0, 2.1, 2.2 Level A

2.4.2 Page Titled

Each page has a unique title element that describes what’s on that page.

Code and Labels, Whole Site, Wording
Cognitive, Visual
Content
WCAG 2.0, 2.1, 2.2 Level A

2.4.3 Focus Order

When a keyboard user tabs through a page, the order goes from top to bottom and left to right, as you would read the page.

Keyboard
Cognitive, Physical/Motor, Visual
Code
WCAG 2.0, 2.1, 2.2 Level A

2.4.4 Link Purpose (In Context)

A link’s destination should be clear from either the link text itself or the surrounding sentence context.

Code and Labels, Wording
Cognitive, Visual
Content
WCAG 2.0, 2.1, 2.2 Level AA

2.4.5 Multiple Ways

Header navigation is not the only way to get around a website; there’s another way, such as on-page links, a sitemap, or a site-wide search.

Whole Site
Cognitive, Visual
Design
WCAG 2.0, 2.1, 2.2 Level AA

2.4.6 Headings and Labels

Headings are descriptive of the content that they contain, form labels clearly describe what information is required, and buttons inform the user what will happen when they’re pressed.

Code and Labels, Wording
Cognitive, Visual
Content
WCAG 2.0, 2.1, 2.2 Level AA

2.4.7 Focus Visible

There’s visible keyboard focus styling to indicate which element you’re currently focused on.

Keyboard, Sensory
Cognitive, Physical/Motor, Visual
Code, Design