The WCAG (Web Content Accessibility Guidelines) is an international guideline on the accessibility of online content.
The Act on the Provision of Digital Services requires compliance with the criteria of the WCAG guidelines, i.e. the criteria of level A and AA of WCAG 2.1 guidelines. An exception is live webcasts (video or audio) which do not have to meet the criteria.
Thus, there are a total of 49 statutory criteria. The Act does not require the fulfilment of AAA level criteria or the criterion 1.2.4 Subtitles (in live broadcasts).
Links from the criteria text on this page direct you to the W3C pages. You can find more guidelines in the Understanding WCAG section of W3C (External link).
1. Perceivable
Information and user interface components must be presentable to users in ways they can perceive.
1.1 Text Alternatives
Provide text alternatives for any non-text content so that it can be changed into other forms people need, such as large print, braille, speech, symbols or simpler language.
1.2 Time-based Media
Provide alternatives for time-based media.
1.3 Adaptable
Create content that can be presented in different ways (for example simpler layout) without losing information or structure.
1.4 Distinguishable
Make it easier for users to see and hear content including separating foreground from background.
2. Operable
User interface components and navigation must be operable.
2.1 Keyboard Accessible
Make all functionality available from a keyboard.
2.2 Enough Time
Provide users enough time to read and use content.
2.3 Seizures and Physical Reactions
Do not design content in a way that is known to cause seizures or physical reactions.
2.4 Navigable
Provide ways to help users navigate, find content, and determine where they are.
2.5 Input Modalities
Make it easier for users to operate functionality through various inputs beyond keyboard.
3. Understandable
Information and the operation of user interface must be understandable.
3.1 Readable
Make text content readable and understandable.
3.2 Predictable
Make Web pages appear and operate in predictable ways.
3.3 Input Assistance
Help users avoid and correct mistakes.
4. Robust
Content must be robust enough that it can be interpreted by by a wide variety of user agents, including assistive technologies.
4.1 Compatible
Maximize compatibility with current and future user agents, including assistive technologies.
5. Conformance
This section lists requirements for conformance to WCAG 2.1. It also gives information about how to make conformance claims, which are optional. Finally, it describes what it means to be accessibility supported, since only accessibility-supported ways of using technologies can be relied upon for conformance. Understanding Conformance includes further explanation of the accessibility supported concept.
5.2 Conformance Requirements
In order for a Web page to conform to WCAG 2.1, all of the following conformance requirements must be satisfied: