As we described in Chapter 8, Build Your Product - Devices, Browsers, and Assistive Technologies, accessible UX design is about creating designs that are usable and enjoyable by people with disabilities. These disabilities include physical, sensory, cognitive, and neurological problems, and can be temporary or permanent.
Web accessibility is about removing barriers that prevent people with disabilities from accessing websites. Everyone should have equal access to information on any website. This means providing multiple, redundant ways of perceiving and interacting with websites. This in turn means being able to translate between different modes of perception and interaction; for example, auditory and visual modalities, or touch, pointer, and keyboard-based interfaces. Multimodal interaction styles, where users are provided with multiple methods for input and output in a system, are increasingly popular, as they promote more natural and rich interaction with an...