WCAG 2.1 from A to Z: How to Ensure Digital Accessibility?
What is WCAG 2.1?
WCAG 2.1 (Web Content Accessibility Guidelines) is an international technical standard that defines how to design websites and mobile applications so they are accessible to people with disabilities (visual, hearing, motor, and cognitive impairments).
Version 2.1 extends previous guidelines by adding requirements for mobile devices and users with low vision.
Structure of WCAG 2.1 and Conformance Levels
The standard is based on four main principles. These are further divided into guidelines, each containing specific success criteria implemented at three levels:
Level A: Absolute minimum. Without it, a website is completely unusable for many users.
Level AA: Industry and legal standard. Required by Polish and European regulations for the public sector and many businesses.
Level AAA: The highest level of accessibility, difficult to implement across an entire website.
POUR Principles – The Foundation of WCAG 2.1
All WCAG 2.1 guidelines are based on four core principles forming the acronym POUR:
Perceivable (Perception) – Content must be presented in a way that can be perceived by users’ senses (sight, hearing).
Operable – The interface and navigation must be usable through different input methods (e.g., keyboard only).
Understandable – Information and website operation must be clear, logical, and predictable.
Robust – The code must be valid and compatible with current and future technologies (browsers, screen readers).
Who Must Comply with WCAG Standards?
Digital accessibility is no longer just a “best practice” but a legal requirement that is continuously expanding:
Public sector (currently)
In Poland, government institutions, local authorities, schools, universities, hospitals, and state-owned companies are legally required to comply with WCAG 2.1 Level AA. This obligation results from the Act of April 4, 2019 on digital accessibility. Non-compliance may result in financial penalties.
Private sector and business
Under the European Accessibility Act (EAA), from June 28, 2025, accessibility standards (based on WCAG) will become mandatory for a large part of private businesses. This will include e-commerce, banking, transport services, telecommunications, as well as VOD platforms and e-books.
Statistics: What Does the Reality Look Like?
Despite growing awareness and stricter regulations, the global state of web accessibility remains alarming. According to the annual WebAIM Million 2026 report (which analyzed one million homepages worldwide):
- 95.9% of websites contained basic accessibility errors detectable through automated testing.
- This means only around 4% of the most popular websites meet minimum WCAG standards.
- The most common issues are still fundamental and easily avoidable: low text contrast (81% of sites), missing alternative text for images (54.5%), and improperly implemented links and buttons.
Useful links and sources
If you want to deepen your knowledge or check specific guidelines for developers and designers, visit the official sources:
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