What is WCAG?
The Web Content Accessibility Guidelines (WCAG) are a globally recognized set of technical standards created by the World Wide Web Consortium (W3C) to ensure websites, documents, and digital experiences are accessible to people with disabilities.
The WCAG standards provide guidance to designers, developers, and content creators ensuring they create digital experiences that are usable for individuals with disabilities—including those with visual, auditory, physical, speech, cognitive, language, learning, and neurological disabilities.
WCAG applies broadly to websites, digital documents (such as PDFs), mobile applications, software, and emerging formats. It is also repeatedly referenced as the standard to follow in laws and rulemaking that govern accessibility. These include the Department of Justice’s (DOJ) Americans with Disabilities Act (ADA) Title II rulemaking, Section 508 of the Rehabilitation Act of 1973, Canada’s Accessibility for Ontarians with Disabilities Act (AODA), and the European Accessibility Act. Because of its global adoption and application, WCAG has become the global benchmark for digital accessibility.
The Evolution of WCAG: From 1.0 to 2.2.
The WCAG standards have evolved over time to incorporate advancements in technology as well as evolving user needs.
WCAG 1.0
Released in 1999, WCAG 1.0 was the first standardized guidance for web accessibility.
It focused heavily on HTML-based web content and introduced 14 guidelines with prioritized checkpoints (Priority 1, 2, and 3). Because version 1.0 was tied closely to older web technologies, WCAG 1.0 has become less practical as digital content has advanced.
WCAG 2.0
Published in 2008, WCAG 2.0 introduced a more flexible, technology-independent structure. This version organized accessibility around four foundational principles (perceivable, operable, understandable, and robust) and standardized success criteria at Levels A, AA, and AAA.
WCAG 2.0 became widely referenced by government accessibility regulations, including Section 508.
WCAG 2.1
Released in 2018, WCAG 2.1 expanded accessibility guidance for mobile usability, people with low vision, and individuals with cognitive and learning disabilities. Version 2.1 added 17 new success criteria on top of the base WCAG 2.0 standard—and retains the same principles, structure, and conformance levels.
WCAG 2.2
Published in 2023, WCAG 2.2 builds on WCAG 2.1, adding guidance to better support users with cognitive disabilities, standards to improve navigation and interaction, and guidelines to remove reliance on difficult authentication methods. WCAG 2.2 adds nine new success criteria to 2.1 and removes one criterion (4.1.1 Parsing) for conformance purposes.
Key Principles of the Web Content Accessibility Guidelines—POUR.
As mentioned, WCAG is organized around four core principles—often summarized as POUR—perceivable, operable, understandable, and robust.
Perceivable
Information must be presented in ways people can recognize and process. This includes providing text alternatives for non-text content, adequate color contrast, captions for multimedia, and adaptable layouts for different devices or assistive technologies.
Operable
Users must be able to navigate and interact with content, regardless of ability. This requires support for keyboard-only navigation, sufficient time to interact with content, clear navigation, and avoidance of visuals that may trigger a seizure.
Understandable
Content should be predictable, readable, and easy to comprehend. This includes consistent navigation patterns, clear labels and instructions, and input assistance to help avoid or correct mistakes.
Robust
Content must be compatible with a wide range of current and future technologies—including assistive technology like a screen reader. This includes following proper coding practices and ensuring clean structure so users and their technology can accurately interpret content.
Levels of WCAG Conformance.
WCAG includes three levels of conformance—A, AA, and AAA. Each level builds upon the requirements of the previous one, meaning Level AA includes all Level A criteria, and Level AAA includes all Level A and AA criteria.
Level A: Basic accessibility standard
Level A establishes the minimum requirements for accessibility. These criteria address the most significant barriers that would make content completely unusable for many people with disabilities. Importantly, following Level A criteria alone is not sufficient to ensure broad usability. Most organizations aim beyond this baseline.
Level AA: Standard compliance
Level AA is the most commonly referenced and required conformance level, aligning with most legal regulations. As mentioned, Level AA covers all Level A criteria plus additional requirements that improve usability and accessibility for a wider range of users.
Level AAA: Highest accessibility standard
Level AAA is the most comprehensive level of conformance but includes guidance that may not be applicable to every application. Level AAA includes all Level A and AA criteria plus enhanced features that provide optimal accessibility for people with a wide range of disabilities.
While Level AAA can significantly improve the experience for many users, it is not typically required by law. Not all content can meet AAA criteria—so organizations usually treat AAA as an aspirational goal if the guidance is applicable.
Global Accessibility Laws and WCAG Standards.
While WCAG itself is not a law, it is widely referenced by legal frameworks around the world as the technical benchmark for digital accessibility. Many countries and regions have implemented legislation that requires public—and, increasingly, private—organizations to make digital content accessible, often specifying WCAG 2.0, 2.1, or 2.2 at Level AA.
The following is an overview of major laws that align with, or reference WCAG.
ADA Title II
The ADA is a U.S. civil rights law prohibiting discrimination on the basis of disability. One section, Title II, of the ADA applies specifically to state and local government entities, requiring them to provide equal access to public programs, services, and activities. Over the years, this has been interpreted to extend beyond physical spaces and include digital experiences as well—digital experiences like websites, PDFs, and mobile applications.
In 2024, the U.S. DOJ clarified the ADA’s application to digital experiences, publishing a final rule that ADA Title II requires digital content to meet WCAG 2.1 Level AA success criteria.
While Title II applies only to public-sector organizations, the ADA is frequently interpreted by courts as applying to private-sector digital experiences as well, under a different section, Title III. Courts often look to this same standard—WCAG 2.1 AA—as its compliance requirement.
Section 508
Section 508 of the U.S. Rehabilitation Act of 1973 requires federal agencies, and organizations selling digital products or services to them, to make electronic and information technology accessible.
The U.S. government’s “508 Refresh” in 2017 aligned Section 508 with WCAG 2.0 Level AA as the official federal accessibility standard, making WCAG the foundation for compliance for websites, software, electronic documents, and multimedia.
Although WCAG 2.1 and 2.2 are more recent, WCAG 2.0 Level AA remains the minimum mandated standard within the refreshed Section 508.
European Accessibility Act (EAA)
The European Accessibility Act (EAA) is a European Union (EU) directive intended to improve the accessibility of products and services across EU member states. The EAA applies to a wide range of private-sector industries—such as e-commerce, banking, transportation, and consumer technology—mandating accessibility for digital content and services.
The EAA references a different set of web standards—EN 301 549. However, this European standard aligns with WCAG 2.1 Level AA.
Accessibility for Ontarians with Disabilities Act (AODA)
The Accessibility for Ontarians with Disabilities Act (AODA) is Ontario Canada’s provincial legislation designed to achieve a fully accessible Ontario. It applies to public-sector organizations and most private businesses with 50 or more employees.
Under the Information and Communications Standard of the AODA, web content must conform to WCAG 2.0 Level AA, with some exceptions (such as live captions and audio descriptions).
The Importance of WCAG for Compliance.
WCAG serves as the foundational technical standard for digital accessibility around the world. Its role in legal compliance is critical for organizations seeking to reduce legal risk, improve usability, and ensure equitable access to information and services.
Reduces legal and regulatory risk
We’ve referenced several laws that cite WCAG as the recommended standard for digital accessibility. Aligning with WCAG helps organizations demonstrate compliance and reduce exposure to legal complaints, lawsuits, financial penalties, and reputational damage.
Improves access and enhances usability
WCAG guidelines are designed to eliminate barriers that prevent individuals with disabilities from accessing digital content. By creating products that mee WCAG requirements, organizations ensure that users with disabilities can fully engage with online services and information.
But WCAG practices don’t just make content accessible for users with disabilities. Following WCAG improves usability for every user by encouraging the creation of clear navigation, logical structure, readable text, and sufficient color contrast.
Broadens consumer base and bolsters brand
A commitment to accessibility increases customer satisfaction and trust—essential for public entities serving communities and businesses aiming to expand their customer base.
Which WCAG Should I Follow?
The most recent version of WCAG—WCAG 2.2 includes the most comprehensive set of standards applicable to the most advanced technology and the broadest range of disability. Even though a specific law may only require conformance with WCAG 2.0 or 2.1, Allyant consistently recommends organizations strive to follow 2.2 guidelines. By doing so, organizations will improve usability for all. They will also reduce future legal risk if laws like the AODA or Section 508 adopt the newer WCAG standards.
Meeting WCAG Standards with Allyant.
Allyant’s advanced software and expert-led services help organizations create websites, mobile apps, software, documents, and other digital content that meet WCAG standards to comply with applicable global laws. To learn how Allyant’s solutions can support your organization, engage our team today.
Frequently Asked Questions.
Because WCAG is a set of standards and not a law, organizations cannot technically comply with WCAG, so the phrase “WCAG compliance” is technically inaccurate. An organization can aim to conform with the standards and guidelines, so the correct phrase is WCAG conformance. However, these two phrases are often used interchangeably.
Achieving WCAG conformance first requires understanding your baseline—how accessible are your current products and services? Most organizations begin by assessing their websites, documents, and applications against WCAG criteria to identify issues. From there, remediation—such as fixing code, improving design, or making documents accessible—is completed to meet WCAG requirements. Validation through manual and assistive-technology testing helps ensure fixes are effective and user-friendly. To maintain conformance long-term, organizations should incorporate accessibility into design and development worflows, regularly monitor new and updated content, and train internal teams. By partnering with the accessibility experts at Allyant, we will help assess and audit, provide guidance for prioritization and remediation, validate results, and support the development of sustainable accessibility programs.
