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What's New in WCAG 2.1

After 4 years of work, we are proud to release our Candidate Recommendation for WCAG 2.1. We will not be reviewing any more Success Criteria for WCAG 2.1. There are 17 new Success Criteria (13 for those within levels A and AA) and a new conformance reporting proposal. Here's the breakdown and the links:

  • 5 SCs at Level A
  • 7 SCs at AA
  • 5 SCs at AAA

Next steps:

The Working Group plans to publish to Candidate Recommendation (CR) in January. The group plans to begin implementation testing with a goal to finalize WCAG 2.1 as a W3C Recommendation by mid 2018, so comments on this draft are critical.

New Level A and AA Success Criteria in WCAG 2.1

Below are the proposed new Success Criteria summarized in plain language. Note: The 63 Success Criteria from WCAG 2.0 are grandfathered into WCAG 2.1.

Short Name (link to it in the WCAG)

Plain language summary of requirements

Who does it help and how? At Risk Status SC # Lvl
Identify Common Purpose

Ensures common names are provided using the HTML autocomplete list.

This will enable future assistive technology to identify them, customise them, add icons or symbols, and present them to cognitive users in different ways.

(With exceptions)

Users with cognitive disabilities, low vision and others who need to personalize the interface, either to simplify it, or another change.   1.3.4 AA

* Reflow

Basically requires Responsive design (or a few tricks to get zoom to work)

(With exceptions)

Users with low vision who need to make things larger. The content will wrap inside the viewport instead of causing horizontal scroll.   1.4.10 AA
* Non-Text Contrast

Extends 3:1 contrast minimums to important graphical information, visible focus indicators and other interactive controls.

(With exceptions)


Users with low vision and cognitive disabilities need help seeing or perceiving information in graphics, interactive components., and focus indicators. (AT RISK of being removed pending implementations and public response) 1.4.11 AA
* Text Spacing

Requires author not to interfere with user style sheets and other CSS based client side interventions. Also, requires enough space around text that the spacing can be spread out a little bit.

Users with low vision or cognitive disabilities who need to override the font, line spacing, paragraph spacing, color scheme etc.   1.4.12 AA
* Content on Hover or Focus

Requires hover effects like custom tooltips etc, not to obscure the trigger that activated them, and helps users move into the hover box without having it close on them.

Users with low vision who need to work without hover behavior obscuring content.


  1.4.13 AA
Character key shortcuts

Requires authors to not use single key shortcuts, or provide a way to turn them off or change them.

Shortcut keys that have a combination of keys are much less likely to be triggered this way.

Users of speech technology. (e.g., If the site hijacks "p" key for shortcut, when the user dictates words such as "happy" the shortcut can be triggered.)

  2.4.11 A
* Label in Name

Requires any visible label that is not the accessible name to be part of the string that makes up the accessible name.

An example, speech users say "click Go" if they see a button with the word "go" visually on it. If the button has an aria-label="submit" then that command will do nothing, and because the accessible name is not visible, the speech user wouldn't know what to say to press it.

But if the word "go" was part of the string in the ACCNAME, (i.e., aria-label="Go, Submit" then saying "Click Go" would activate the button.   2.4.12 A
Pointer gestures Requires authors to ensure the user can perform touch functions with assistive technology or one finger. Users with dexterity disabilities, those who are blind or have other disabilities that interfere with the use of timed gestures, multi finger, or complex gestures. They can use simple pointer events.   2.5.1 A
Pointer Cancellation

Requires authors to use up-event triggering (which is standard) on interactive components.

(With exceptions)

Users with dexterity disabilities who miss the target. It ensures the target is not triggered on touch down, but rather on touch up allowing them to move their finger away from the wrong target if they miss.

  2.5.2 A
Motion Actuation Will require functionality from shaking, tilting etc., also be usable with interface components. People who have a mounted device, or who cannot shake or tilt a device   2.6.1 A

Requires authors not to rely on a screen orientation.

(With exceptions)

Users who have their device mounted, or who cannot change orientation can still use the site even though they have a fixed orientation.   2.6.2 AA
Status Changes

For HTML pages, when there is a visible status message, this requires authors to use aria-live roles or attributes to notify AT users when something on the page changes.

(With exceptions)

Users of AT who can't see changes or have trouble perceiving visible status messages on a page, such as shopping cart updates. Their AT will announce the status message that was visibly added to the page.


3.2.6 AA


New Level AAA new Success Criteria in WCAG 2.1

Short Name (link to it in the WCAG)

Plain language summary of requirements

Who does it help and how? At Risk Status SC # Lvl
Identify Purpose Builds on the Level AA "Identify Common Purpose" and anticipates the release of Cognitive meta-data that will be used by assisitve technology to personalize, and simplify user interfaces, so that resistive technology can identify them, customise them, add icons or symbols, and present them to cognitive users. Users with cognitive disabilities, low vision and others who need to personalize the interface, either to simplify it, or another change. (AT RISK of being removed pending implementations and public response) 1.3.5 AAA
Timeouts Users are warned of the duration of any user inactivity which could cause data loss, unless the data is preserved for more than 20 hours of inactivity Helps users with cognitive disabilities and those with disabilities that woukd cause them to take a break from an activity,   2,2.6 AAA
Animation from interactions

Requires authors not to use motion as a result of a user clicking (or activating) something, or provide a way to turn it off. Addresses parallax scrolling and CSS animations etc.

Users with vestibular disabilities (motion sickness) and those with cognitive disabilities who need to use the site without being triggered. (AT RISK of being removed if comments can't be resolved)


Target Size Addresses hand tremors and mobile environments       AAA
Concurrent Input Mechanisms

Ensures authors don't interfere with the way a user is accessing content. For instance, don't disable mouse interaction is a user has a touch screen.

It doesn't require authors to do anything extra, just ensures they don't actively disable input modalities.

Users who need a variety of ways to input due to repetitive strain, or are limited to one less common input way to interact with the computer.   2.5.5 AAA


Other changes include:

  • Addition to Optional Components of a Conformance Claim to include metadata about the accessibility features and level of accessibility of the document. This will help users with disabilities identify accessible ePub books online, and give search engines tools to find accessible content.

How to comment?

Click a link to a Success Criterion in the table and ask yourself the following:

    • Is it testable by expert human evaluation or automation?
    • Is it implementable across technologies (or are exceptions sufficient)?
    • Is it scalable across human languages?
    • Could your organization implement 2.1? Why or why not?
    • If not, do you have suggestions to improve it? (but note that we can't change anything for this Candidate Recommendation version, only drop Success Criteria at risk, or cycle around for another Candidate Recommendation which would be a last resort)

To comment, open a new issue on Github.

or email public-agwg-comments@w3.org

Breaking these up by Task Forces:

  • Cognitive Task Force (5 New SC Proposals)
    • 1 Level AA
    • 2 Level AAA
  • Low Vision Task Force (4 New SC Proposals)
    • 4 Level AA
  • Mobile Task Force (10 New Proposals)
    • 4 Level A
    • 2 Level AA
    • 3 Level AAA
  • AD HOC: 1 level AAA
  • ePub Task Force: 1 conformance addition

Feel free to comment on this article on Twitter @davidmacd

Author information:

David MacDonald is a 15 year WCAG veteran and co-editor of Using WAI ARIA. Opinions are my own.


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