WCAG Principles
WCAG is built on four main principles. Often abbreviated as POUR, they individually explain what people working with digital products and services should look at when thinking about digital accessibility.
1. Perceivable
Content must be presented in ways that users can perceive. A good example of this principle is providing text alternatives for non-text content, such as images and videos, creating adaptable options to communicate with different audiences in the same meaningful way.
2. Operable
User interface components and navigation must be operable. This means making all functionality available from a keyboard, giving users enough time to read and navigate through your content, and not designing content in a way that is known to cause seizures.
3. Understandable
Information and the operation of the user interface must be understandable. This involves making text readable and understandable, ensuring web pages appear and operate in predictable ways, and helping users avoid and correct mistakes.
4. Robust
Content must be robust enough to be interpreted reliably by a wide variety of user agents, including assistive technologies. This means using clean and consistent HTML code, applying ARIA-labels when necessary, and utilise other methods that can be reliably processed by assistive tools.