W3C Accessibility Guidelines (WCAG) 3.0 will provide a wide range of recommendations for making web content more accessible to users with disabilities. Following these guidelines will address many of the needs of users with blindness, low vision and other vision impairments; deafness and hearing loss; limited movement and dexterity; speech disabilities; sensory disorders; cognitive and learning disabilities; and combinations of these. These guidelines address accessibility of web content on desktops, laptops, tablets, mobile devices, wearable devices, and other web of things devices. The guidelines apply to various types of web content including static, dynamic, interactive, and streaming content; visual and auditory media; virtual and augmented reality; and alternative access presentation and control. These guidelines also address related web tools such as user agents (browsers and assistive technologies), content management systems, authoring tools, and testing tools.

Each guideline in this standard provides information on accessibility practices that address documented user needs of people with disabilities. Guidelines are supported by multiple outcomes to determine whether the need has been met. Guidelines are also supported by technology-specific methods to meet each outcome.

This specification is expected to be updated regularly to keep pace with changing technology by updating and adding methods, outcomes, and guidelines to address new needs as technologies evolve. For entities that make formal claims of conformance to these guidelines, several levels of conformance are available to address the diverse nature of digital content and the type of testing that is performed.

See WCAG 3 Introduction for an introduction and links to WCAG technical and educational material.

To comment, file an issue in the W3C wcag3 GitHub repository. The Working Group requests that public comments be filed as new issues, one issue per discrete comment. It is free to create a GitHub account to file issues. If filing issues in GitHub is not feasible, send email to public-agwg-comments@w3.org (comment archive). In-progress updates to the guidelines can be viewed in the public editors’ draft.



What’s new in this version of WCAG 3?

About WCAG 3

This specification presents a new model and guidelines to make web content and applications accessible to people with disabilities. The W3C Accessibility Guidelines (WCAG) 3.0 support a wide set of user needs, use new approaches to testing, and allow frequent maintenance of guidelines and related content to keep pace with accelerating technology change. WCAG 3 supports this evolution by focusing on the functional needs of users. These needs are then supported by outcomes and technology-specific methods to meet those needs. 

WCAG 3 is a successor to Web Content Accessibility Guidelines 2.2 [[WCAG22]] and previous versions, but does not deprecate WCAG 2. It will also incorporate content from and partially extend User Agent Accessibility Guidelines 2.0 [[UAAG20]] and Authoring Tool Accessibility Guidelines 2.0 [[ATAG20]]. These earlier versions provided a flexible model that kept them relevant for over 15 years. However, changing technology and changing needs of people with disabilities have led to the need for a new model to address content accessibility more comprehensively and flexibly.

There are many differences between WCAG 2 and WCAG 3. Content that conforms to WCAG 2.2 A and AA is expected to meet most of the minimum conformance level of this new standard but, since WCAG 3 includes additional tests and different scoring mechanics, additional work will be needed to reach full conformance. Since the new standard will use a different conformance model, the Accessibility Guidelines Working Group expects that some organizations may wish to continue using WCAG 2, while others may wish to migrate to the new standard. For those that wish to migrate to the new standard, the Working Group will provide transition support materials, which may use mapping and other approaches to facilitate migration.

Section status levels

As part of the WCAG 3 drafting process each normative section of this document is given a status. This status is used to indicate how far along in the development this section is, how ready it is for experimental adoption, and what kind of feedback the Accessibility Guidelines Working Group is looking for.



The following guidelines are being considered for WCAG 3. They are currently a list of topics which we expect to explore more thoroughly in future drafts. The list includes current WCAG 2 guidance.

The individuals and organizations that use WCAG vary widely and include web designers and developers, policy makers, purchasing agents, teachers, and students. To meet the varying needs of this audience, several layers of guidance will be provided including functional categories of disabilities, general guidelines, outcomes that can be tested, a rich collection of methods, resource links, and code samples.

The following guidelines are an initial list that the working group will be exploring. The following guidelines are initial groupings to guide the next phase of work. They should be considered drafts and should not be considered as final content of WCAG 3.

As more content is developed, this section will be a list of guidelines with a unique short name, and the text of the requirement written in plain language. The list is currently in alphabetical order, but we do not expect that to persist.

Aid navigation

The web site or app aids navigation

Audio and video alternatives

Video and audio have alternatives

Clear language

Content uses clear language

Clear purpose

Controls have clear purpose

Color and contrast

Contents use sufficient contrast and do not rely on color alone

Consistent design

The web site or app has a consistent design

Content order

Contents are programmatically and visually ordered

Control and focus appearance

Appearance of controls and focus support keyboard and pointer use

Control semantics

Controls have correct semantic markup

Error notification

Controls notify users when making mistakes

Error prevention

User processes prevent users from making mistakes

Flexible views

Views are flexible

Harm from motion

On-screen motion does not cause harm

Keyboard support

The web site or app supports the keyboard

Mobile and pointer support

The web site or app supports mobile and pointer inputs

Non-visual alternatives

Images and graphics have non-visual alternatives

Prevent harm

The web site or app does not cause harm

Process cognitive load

User processes do not increase cognitive load

Provide help

The web site or app provides help

Structured content

Views have structure that helps user orient and navigate

Text appearance and semantics

Text uses appropriate layout and semantics

Timing and interruptions

The web site or app minimizes the impact of timing and interruptions

User control

Users have ability to control audio, movement, and auto updating



You might want to make a claim that your content or product meets the WCAG 3 guidelines. If it does meet the guidelines, we call this “conformance.” To conform to WCAG 3, your test results must show that your project is accessible.

If you want to make a formal conformance claim, you must use the process described in this document. However, conformance claims are not required and your content can conform to WCAG 3, even if you don’t want to make a claim. You can still use this process to test your project’s accessibility.

There are two types of content in this document:

There are a variety of ways to say what is required in WCAG 3. We are experimenting with different approaches. Once we have developed enough guidelines, we will test how well each works. Here are some of the ideas for WCAG 3 requirements:

We intend to address the following topics in the future, but for now, you can skip them.

Normative requirements

In addition to this section, the Guidelines and Conformance sections in WCAG 3 provide normative content and define requirements that impact conformance claims. Introductory material, appendices, sections marked as non-normative, diagrams, examples, and notes are informative (non-normative). Non-normative material provides advisory information to help interpret the guidelines but does not create requirements that impact a conformance claim.

The key words MAY, MUST, MUST NOT, NOT RECOMMENDED, RECOMMENDED, SHOULD, and SHOULD NOT in this document are to be interpreted as described in BCP 14 [[RFC2119]] [[RFC8174]] when, and only when, they appear in all capitals, as shown here.

Approaches to conformance

WCAG 3 will include a new conformance model to address a wider range of user needs, test a wider range of technologies and support new approaches to testing. We are exploring several approaches to conformance. After studying the comments on the previous draft, these are the concepts that showed promise. We are giving an overview in this draft, but we continue to test the combination of the concepts.

There are several goals for this new conformance model:

  1. Develop a model that encourages web sites to continue to improve accessibility (vs. stopping at the previous AA level);
  2. Better reflect the lived experience of people with disabilities, who successfully use sites that have some content that does not meet WCAG 2.0 AA, or who encounter barriers with sites that meet WCAG 2.0 AA; and
  3. Allow for bugs and oversight by content authors, provided the impact of them upon users with disabilities is not substantial.

The proposed approaches can fit together in a variety of ways. We will be testing these approaches and others for validity, reliability, sensitivity, adequacy, complexity and equity. We welcome suggestions on ways to improve these approaches to better meet these criteria and concerns about how they might affect accessibility. The working group plans to select from or even replace these options based on feedback, prototyping, and testing.

There are two main approaches to evaluating accessibility that are promising. There are also detailed ideas that support these approaches. The two main approaches are:

There are additional ideas that support these two approaches and can be used or combined in many different ways.

The details of these approaches change as we assemble them into a coherent whole. This draft gives a high level overview of these approaches so we can give an update and receive feedback on the individual approaches we are considering.

As we continue developing conformance, we seek input on the following:

  • Which option has the best chance of adoption and why?
  • How well do these approaches support regulatory needs?
  • How will these approaches be integrated into a conformance model (including levels or scores)?

Next steps include:

  • Further refine options,
  • Test the validity, reliability, sensitivity, adequacy, complexity and equity of the various models using these approaches, and
  • Write sample guidelines to test out each option.

Outcomes and methods

As we continue developing outcomes and methods, we seek input on how well the approach to outcomes, assertions and tests defined here supports additional requirements not addressed in 2.2.

Next steps include:

  • Get feedback from designers, developers, and other communities on wording choice,
  • Finalize names and descriptions of scope and tests,
  • Develop detailed examples of methods and tests,
  • As we develop example outcomes and methods, further explore conditions and how multiple measurements might be used to meet an outcome.
  • Address all GitHub issues under test types and terminology milestone.


Outcomes are verifiable statements that allow testers to reliably determine if the content being evaluated satisfies the user needs identified in the Guideline. All outcomes and assertions that relate to a Guideline will be listed together to encourage adoption of higher levels of accessibility.

Each outcome is associated with at least one method. Methods are informative and kept in how to documents. Each method contains techniques for meeting the outcome, examples, resources, and sets of tests for evaluating the outcome. Methods can apply to a specific technology, such as HTML, or can be more generic where the advice applies no matter what technology, such as the methods supporting the Clear Language guideline.

Outcomes are written so that testers can determine the accessibility of technologies based solely on the outcome, even when methods do not yet exist for those technologies.

Testing outcomes

Types of tests

WCAG 3 includes two (2) types of tests which are evaluated:

  • Quantifiable tests: Tests where there is a high degree of consistency between test results from different testers. Examples include testing whether certain properties exist in the content or if they match a value specified by the requirement.
  • Qualitative tests: Tests that rely on a qualitative evaluation based on existing criteria. Test results may vary between testers who understand the criteria. One example is evaluating the quality of alternative text used to meet a requirement for alternative text.

Most tests have prescribed ways to meet the test. In some cases, the ways to meet the test will change based on a specific condition being met (example: the human language of the content).

Although content may satisfy all outcomes using quantifiable and qualitative tests, the content may not always be usable by people with a wide variety of disabilities. The assertions (see Section 3.4.1 Assertions) are designed to address this problem.

Quantifiable tests

Quantifiable tests rely on measuring properties of the content based on nominal values. The test results are objectively verifiable, and avoid variation of test results between different testers. Values are quantifiable. They could be boolean (true/false), for example to check the presence of titles, text alternatives, and accessible names. Other values could include numerical thresholds; for example, to check color luminosity ratios.

Each method using quantifiable tests includes:

  • the values being tested; and
  • an algorithm to measure the properties of the content based on the values.
Qualitative tests

Qualitative tests rely on evaluating content based on a set of defined qualities and exceptions. The set of qualities and exceptions limit the scope of decisions, to minimize variation of test results arrived at by different testers. Still, some level of qualitative assessment is required, therefore the accuracy of the test results also depends on the knowledge and context of the testers to some degree.

Each method using qualitative tests includes:

  • the defined qualities being tested; and
  • guidance on evaluating how well the content meets the defined qualities.
Test scopes

Testing outcomes use items, views, user processes, and the aggregate to define what is being tested.

Items are the smallest testable unit. They may be interactive components such as a drop down menu, a link, or a media player. They may also be units of content such as a word, a phrase, a label or error message, an icon, or an image.

Views include all content visually and programmatically available without a substantive change. Conceptually, views correspond to the definition of a web page as used in WCAG 2, but are not restricted to content meeting that definition. For example, a view could be considered a “screen” in a mobile app or a layer of web content – such as a modal.

User processes are a series of user actions, and the distinct interactive views and items that support the actions, where each action is required to complete an activity. A user process may include a subset of items in a view or a group of views.

Examples of a process include:

  • Logging into a web site and being recognized as an authenticated user;
  • Ordering an item, in which case the process includes the entire set of tasks from searching for the item, adding it to the shopping cart, paying for it, and receiving confirmation;
  • Submitting tax information, from start to end of the process; and
  • Interacting with other users in a virtual reality environment.

A process is comprised of one or more views or subsets of views. Only the part of the views that support the user process are included in a test of the user process.

The aggregate is the combination of items, views, and user processes that collectively comprise the web site, set of web pages, web app, etc.


Some tests only apply in certain situations. Testing may occasionally require determining and referencing which specifications are being tested. Methods will note whether a test always applies or under what conditions a test applies. Both quantitative and qualitative tests can be conditional.

Assertions and procedures

As we continue developing this content, we seek input on the following:

  • Can assertions be used to record accessibility work that is not required in the guidelines? This could include advance work on guidance not yet added to the guidelines.
  • What optional supporting documentation should organizations provide with an assertion?
  • Is there a need for WCAG 3 to require proof of an assertion, and if so, what documentation should be required as proof?
  • Should assertions be dated, expire, or be reviewed on a regular basis?
  • Can steps in a procedure duplicate tests in other parts of the guidelines? If so, how should those be handled?
  • Can assertions exist outside of conformance? For example, can they be used as an internal benchmark rather than for a claim of conformance?
  • Can assertions be used at the most basic level of conformance? If so, how?
  • How can small organizations use assertions without unrealistic burden?
  • As written, outcomes and assertions are at the same level. Would moving assertions to the test level be more effective?
  • The AGWG is considering whether and how assertions can be applied to the Bronze level.
  • The AGWG is considering what will qualify as a procedure in WCAG 3. A procedure may be limited to guidance:
    • approved by AGWG and listed in WCAG,
    • that references publicly published guidance, or
    • that meets criteria specified in WCAG
    or it may be any process that an organization uses to improve accessibility. Comments or criticism of these alternatives is welcome.

Next steps include:

  • Better define procedure,
  • Develop detailed examples of methods and test,
  • Test the accuracy, reliability, repeatability, etc. of this approach


An assertion is a formal claim of fact, attributed to a person or organization. In WCAG 3, an [=assertion=] is an attributable and documented statement of fact regarding procedures practiced in the development and maintenance of the content or product to improve accessibility.

Using assertions

Assertions may supplement [=methods=] in one or more outcomes. Assertions should only be used on outcomes and guidelines that allow assertions. Organizations can make an assertion that they followed a procedure to claim conformance. Results when testing assertions are true/false - the organization making the assertion either provided the required documentation or it did not.

Procedures used in assertions may be implemented at the organization level, during design and development, or during testing.

Examples of procedures that may be used during implementation might include:

  • Training,
  • FTE (Full Time Equivalent) assignments,
  • Skills testing,
  • Coordination and documentation of accessibility processes, or
  • Setting the priority for remediation.

Examples of procedures that may be used to evaluate accessibility might include:

  • Usability testing,
  • Heuristic evaluation, or
  • Assistive technology testing.

Documenting assertions

Assertions must be documented as part of the conformance claim process. The required information may also be made available through the web site.

Assertions might include the following information:

  • The statement being asserted,
  • The date of the assertion,
  • The date or date range the procedure was completed,
  • The scope of the assertion,
  • Contact information for the person or group making the assertion, and
  • The outcome(s) or guideline(s) supported by the assertion.

An alternative to specifying assertions at the outcome or guideline level might be to require the assertion apply to the scope of the conformance claim.

Supporting documentation for assertions

WCAG recommends maintaining additional information that an organization can use to improve or validate procedures and assertions. WCAG will not require organizations to provide supporting documentation to conform.

Testing assertions

The quality of an assertion can be tested based on how well the assertion meets the documentation requirements for assertions (See Documenting Assertions). Conforming to WCAG does not require testing supporting documentation; however, organizations may decide to adopt additional documentation requirements based on the procedure being asserted.

Conformance levels

WCAG 3 defines three levels of conformance: bronze, silver, and gold. While it is easy to replicate the WCAG 2 A, AA, AAA by renaming the levels, there is an opportunity to improve accessibility for people with disabilities by using a more advanced approach.

Bronze is the minimum conformance level. Content that does not meet the requirements of the bronze level does not conform to WCAG 3. To reach Bronze level, the scope claimed in the conformance statement must pass a subset of outcomes and assertions. The subset will require enough outcomes and assertions to improve equity across functional needs.

Silver level incentivizes organizations to go further to improve accessibility. One possibility that we are examining is that Silver level points can accumulate even prior to completing bronze but are not usable until Bronze is achieved. The goal is to encourage organizations to go beyond the minimum, especially where organizations want to be recognized for their efforts to go beyond minimum accessibility.

Gold level identifies measures we want to include for those organizations that do achieve Silver so that some can stand out as exemplary, cutting edge, and role models. There are a number of ideas that will be developed further once more of the conformance structure is solidified.

Issue severity

Severity rating could contribute towards scoring and prioritization.

As we continue developing this content, we seek input on the following:

  1. Is every issue critical to someone, making this concept invalid?
  2. How best to assign severity, particularly if testers have different ideas on what is critical?
  3. How do we incorporate context/process/task? Is that part of scoping, or issue severity? Both are important to the end result.
  4. What to do with non-critical issues?
  5. If included, how will situations where severity depends on context be handled?
  6. Can the matrix inform designation of functional categories? For example, the Text Alternative Available outcome.
  7. How will issue severity fit into levels? For example:
    • “Bronze” could be an absence of any critical or high issues;
    • “Silver” could be an absence of any critical, high, or medium issues.
  8. How to account for cumulative issues becoming critical?
  9. Would another approach be more effective, for example assigning critical issues after testing is complete based on task or type of task rather than by test?

Next steps include:

  • Testing the assumption that some failures cause a greater impact to users than others or whether all guidelines and contexts are important to some individuals.
  • Explore whether the concept of issue severity can be applied consistently and effectively.

Outcomes may allow for the concept of varying severity. High severity issues are those which prevent users from completing user processes (tasks).

Tests could include critical issues. Each test could have a category of severity, so some tests will be flagged as causing a critical issue. Examples of critical issues in tests are at Text Alternative Available and Translates Speech And Non-Speech Audio.

Adjectival ratings

Adjectival Ratings allow test results to go beyond Pass or Fail to show progress towards a goal or exceeding a goal. Example of Possible adjectival ratings are:

Outcomes or guidelines could be evaluated using adjectival ratings on both directly quantifiable outcomes and qualitative measures that are asserted. Outcomes might be assigned an adjectival rating based on methods used to meet the outcome and issue severity. Guidelines might be assigned an adjectival rating based on the outcomes and assertions completed under the guideline.


We are exploring whether percentages could apply to Bronze but have not found a model to date where this works without adding complexity and time needed for testing.

As we continue developing this content, we seek input on the following:

  • How can percentages be used in a way that is equitable across disabilities?

In this approach, percentage of outcomes and assertions passed or percentage passed at a certain adjectival rating might be used to conform to Silver and Gold levels.

Pre-assessment checks

Pre-Assessment checks are tests or criteria that implementers can use to determine if they are ready to assess conformance. The intent of specifying these would be to help implementers prepare for conformance testing, not to create a new level of conformance. Examples of pre-assessment checks might be:

Only accessibility-supported ways of using technologies

We continue to explore how the WCAG 2 concept of accessibility-supported fits into proposed conformance models.

Defining conformance scope

When evaluating the accessibility of content, WCAG 3 requires the outcomes apply to a specific scope. While the scope can be an all content within a digital product, it is usually one or more sub-sets of the whole. Reasons for this include:

WCAG 3 therefore defines two ways to scope content: views and processes. Evaluation is done on one or more complete views or processes, and conformance is determined on the basis of one or more complete views or processes.

Conformance is defined only for processes and views. However, a conformance claim may be made to cover one process and view, a series of processes and views, or multiple related processes and views. All unique steps in a process MUST be represented in the set of views. Views outside of the process MAY also be included in the scope.

We recognize that representative sampling is an important strategy that large and complex sites use to assess accessibility. While it is not addressed within this document at this time, our intent is to later address it within this document or in a separate document before the guidelines reach the Candidate Recommendation stage. We welcome your suggestions and feedback about the best way to incorporate representative sampling in WCAG 3.

Conformance requirements

For technology to conform to WCAG 3, the following conformance requirements apply:

  1. Conformance level - Content MUST meet the requirements of the selected conformance level.

Conformance claims

Conformance claims are not required. Authors can conform to WCAG 3 without making a claim. The material below describes how to make a conformance claim if that option is chosen.

Required components of a conformance claim

A conformance claim MUST include the following information:

  1. Date of the claim;
  2. Guidelines title, version and URI W3C Accessibility Guidelines 3.0 at https://www.w3.org/TR/wcag-3.0/
  3. Conformance level satisfied: (bronze, silver, or gold);
  4. A concise description of the views and processes, such as a list of URIs for which the claim is made, including any state changes which lead to a new view; and
  5. The technology including the hardware, software, and assistive technology used to test the claim.

Example conformance claim

On 12 August 2020, the following 10 views and 2 processes conform to WCAG 3 at a bronze level. Processes were selected because they are the most common activities on the web site and include 4 unique views. The other 6 views are the most commonly used.

These were tested using Firefox and Chrome on a Windows platform. The assistive technology used included JAWS and Dragon.

Conforming alternative version

We continue to explore how the WCAG 2 concept of conforming alternative versions fit into proposed conformance models.

User-generated content


User-generated content is content written by the public and customers. WCAG 3.0 may use different advice or steps for user-generated content to improve accessibility than for content created by the publisher. WCAG 3.0 proposes that organizations identify user-generated content and identify the steps taken to encourage accessibility.

It remains to be determined how to address user-generated content that has accessibility issues; and to define what minimum thresholds might be acceptable. We expect WCAG 3 to provide this guidance within individual guidelines and outcomes and to support testing for conformance. The working group is looking at alternative requirements to apply to user-generated content guideline by guideline, and is seeking feedback on what would serve as reasonable requirements on how to best support accessibility in user-generated content with known (or anticipated) accessibility issues.

One example would be “alternative text”. The Authoring Tool Accessibility Guidelines (ATAG) has specific guidance for providing a mechanism for alternative text. The ATAG 2.0 Guideline B.2.3 - “Assist authors with managing alternative content for non-text content” could be adapted to provide specific, guideline-related guidance for user generated alternative text.

The working group intends to more thoroughly address the contents and the location of an accessibility statement in a future draft.

Web content publishers may include content provided by the users of their digital products. We refer to such content as “user-generated content”.

Examples of user-generated content include:

User-generated content is provided for publication by visitors where the content platform specifically welcomes and encourages it. User-generated content is content that is submitted through a user interface designed specifically for members of the public and customers. Use of the same user interface as an authoring tool for publication of content by agents of the publisher (such as employees, contractors, or authorized volunteers) acting on behalf of the publisher does not make that content user-generated content. The purpose of the user-generated content conformance section is to allow WCAG 3 outcomes and methods to require additional or different steps to improve the accessibility of user-generated content.

An important part of WCAG conformance is the specific guidance that is associated with individual WCAG 3 guidelines and outcomes. Not all WCAG 3 guidelines will have unique outcomes and testing for user-generated content. Unless user-generated content requirements are specified in a particular guideline, that guideline applies as written whether or not the content is user generated.

The web content publisher should identify all locations of user-generated content (such as commentary on hosted content, product descriptions for consumer to consumer for sale listings, and restaurant reviews) and perform standard accessibility evaluation analysis for each. If there are no accessibility issues, the user-generated content is fully conforming.

Steps to conform

If accessibility issues are identified, or if the web site author wants to proactively address potential accessibility issues that might arise from user-generated content, then all of the following must be indicated alongside the user-generated content or in an accessibility statement published on the web site or product that is linked from the view or page in a consistent location:

  1. Clearly identify where user-generated content can be found on the publisher’s digital product (perhaps by id href);
  2. Clearly identify the steps taken to encourage accessibility in user-generated content such as prompting the user for alternative text for their uploaded images before they are accepted and prohibiting text attributes except as they are part of semantic markup such as strong, headings, etc.;


Many of the terms defined here have common meanings. When terms appear with a link to the definition, the meaning is as formally defined here. When terms appear without a link to the definition, their meaning is not explicitly related to the formal definition here. These definitions are in progress and may evolve as the document evolves.


Adequacy is subtle metric, but important to WCAG 3 proposals. Adequacy describes if the formulas being used to process and score the accessibility testing results are using such a small interval that small changes in accessibility do not cause large changes in scoring. Benchmarking Web Accessibility Metrics, Vigo, Lopes, O Connor, Brajnik, Yesilada 2011.

Adjectival Ratings

A system to report evaluation results as a set of human-understandable adjectives.


A formal claim of fact, attributed to a person or organization. An attributable and documented statement of fact regarding procedures practiced in the development and maintenance of the content or product to improve accessibility.

Automated evaluation

Evaluation conducted using software tools, typically evaluating code-level features and applying heuristics for other tests.

Automated testing is contrasted with other types of testing that involve human judgement or experience. [=Semi-automated evaluation=] allows machines to guide humans to areas that need inspection. The emerging field of testing conducted via machine learning is not included in this definition.

Best Practice

Methods which are not required and meet a higher requirement than methods required to conform to Bronze.


Complexity refers to the resources required to accomplish the conformance testing. These could be crawler time, or time for human judgment testing. This would be a useful metric to have to answer the question of how much time WCAG 3 takes to test as compared to WCAG 2. Benchmarking Web Accessibility Metrics, Vigo, Lopes, O Connor, Brajnik, Yesilada 2011.


Satisfying all the requirements of the guidelines. Conformance is an important part of following the guidelines even when not making a formal Conformance Claim.

See Conformance.


To declare something outdated and in the process of being phased out, usually in favor of a specified replacement.

Deprecated documents are no longer recommended for use and may cease to exist in the future.


Equity is the outcome of processes and actions that ensure the spectrum of human reality obtains what is needed to participate, not solely access. As equity relates to WCAG it is about the impact the standards/guidelines have on people with disabilities, along with actually including people with disabilities in the work.

The process of examining content for conformance to these guidelines.
Different approaches to evaluation include automated evaluation, semi-automated evaluation, human evaluation, and user testing.
Functional need

A statement that describes a specific gap in one’s ability, or a specific mismatch between ability and the designed environment or context.


High-level, plain-language content used to organize outcomes.

Guidelines provide a high-level, plain-language version of the content for managers, policy makers, individuals who are new to accessibility, and other individuals who need to understand the concepts but not dive into the technical details. They provide an easy-to-understand way of organizing and presenting the outcomes so that non-experts can learn about and understand the concepts. Each guideline includes a unique, descriptive name along with a high-level plain-language summary. Guidelines address functional needs on specific topics, such as contrast, forms, readability, and more. Guidelines group related outcomes and are technology-independent.

Human evaluation

Evaluation conducted by a human, typically to apply human judgement to tests that cannot be fully automatically evaluated.

Human evaluation is contrasted with automated evaluation which is done entirely by machine, though it includes semi-automated evaluation which allows machines to guide humans to areas that need inspection. Human evaluation involves inspection of content features, by contrast with user testing which directly tests the experience of users with content.


Content provided for information purposes and not required for conformance.


Detailed information, either technology-specific or technology-agnostic, on ways to meet the outcome as well as tests and scoring information.


Content whose instructions are required for conformance.


Result of practices that reduce or eliminate barriers that people with disabilities experience.

See Outcomes.


A sequence of steps that need to be completed to accomplish an activity / task from end-to-end.


The reproducibility and consistency of scores i.e. the extent to which they are the same when evaluations of the same resources are carried out in different contexts (different tools, different people, different goals, different time). This would be particularly useful to ensure that similar results are achieved by different testers. It would also be useful to see if different testers would select the same path or off-path decisions. Representative sampling tests also fit in this category. Benchmarking Web Accessibility Metrics, Vigo, Lopes, O Connor, Brajnik, Yesilada 2011.

Semi-Automated Evaluation

Evaluation conducted using machines to guide humans to areas that need inspection.

Semi-automated evaluation involves components of automated evaluation and human evaluation.


Sensitivity of a metric is related to the extent that changes in the output of the metric are quantitatively related to changes of the accessibility of the web site being analyzed. This metric is useful for determining if the conformance proposal captures the impact of the severity of accessibility barriers on the final score and if different disabilities are treated equally by the proposal. Benchmarking Web Accessibility Metrics, Vigo, Lopes, O Connor, Brajnik, Yesilada 2011.

Set of Tests

A group of tests that supports a method.


Mechanism to evaluate implementation of a method.


Technology-specific approach to follow a method.

User need

The end goal a user has when starting a process through digital means.

User testing

Evaluation of content by observation of how users with specific functional needs are able to complete a process and how the content meets the relevant outcomes.


The extent to which the measurements obtained by a metric reflect the accessibility of the web site to which it is applied. Does the rating that a web site or digital product achieve in any conformance proposal actually reflect the rating that it should get? Benchmarking Web Accessibility Metrics, Vigo, Lopes, O Connor, Brajnik, Yesilada 2011. Accessed on 29 July 2020

Privacy Considerations

The content of this document has not matured enough to identify privacy considerations. Reviewers of this draft should consider whether requirements of the conformance model could impact privacy.

Security Considerations

The content of this document has not matured enough to identify security considerations. Reviewers of this draft should consider whether requirements of the conformance model could impact security.

Guidelines development methodology


WCAG 3 includes some of the information from WCAG 2, guidelines for tools to create web content (ATAG), and guidelines for browsers, media players, and similar software (UAAG). The WCAG 3 design is based on research. You can read more about the Requirements for WCAG 3.0.

Relationship to other W3C guidelines

The Web Content Accessibility Guidelines (WCAG) 2.0 [[WCAG20]] were designed to be technology neutral, and have stayed relevant for over 10 years. The Authoring Tool Accessibility Guidelines (ATAG) 2.0 [[ATAG20]] provide guidance for various types of software that assist people in writing accessible content. User Agent Accessibility Guidelines (UAAG) 2.0 [[UAAG20]] offers useful guidance to user agent developers and has been implemented on an individual success criterion basis.

These guidelines have normative guidance for content and helpful implementation advice for authoring tools, user agents, and assistive technologies.

For more details about differences from previous guidelines, see Appendix: Differences From WCAG 2.

Goals and requirements

The goal of WCAG 3 and supporting documents is to make digital products including web, ePub, PDF, applications, mobile apps, and other emerging technologies more accessible and usable to people with disabilities. It is the intention for WCAG 3 to meet this goal by supporting a wider set of user needs, using new approaches to testing, and allowing more frequent maintenance of guidelines to keep pace with accelerating technology change. The hope is that WCAG 3 will make it significantly easier for both beginners and experts to create accessible digital products that support the needs of people with disabilities.

Research and design work performed by the Silver Task Force identified key requirements needed to improve upon the existing WCAG 2 structure. These requirements, presented in the Requirements for WCAG 3 document, shaped the guidelines that follow and should be taken into account when evaluating and updating the guidelines.

Differences from WCAG 2


Outcomes are different from WCAG 2 success criteria. Compared to success criteria, outcomes are written to be:

The design of outcomes allows more varied needs of people with disabilities than could have been included in WCAG 2. 

Methods map approximately to WCAG 2 Techniques documents.

Approximate mapping of WCAG 2 and WCAG 3 documentation

Success Criteria Outcomes
Techniques Methods
Understanding How-to

Change log


Prior Contributors