- Visual impairment – assistive technologies such as screen reading software and screen magnifiers are the most common tools for this audience. Screen readers work effectively only if there are text alternatives to imagery, charts and animation, and the page has been properly coded using structural mark-up. Screen magnifiers also rely on well-structured page design.
- Hearing impairment – these users rely on text captioning to understand videos or audio files.
- Motor impairments – people with limited muscle control often find the mouse or keyboard difficult to use. These users often use speech recognition systems that allow them to speak commands to their computer.
- Cognitive disability – people with reading difficulties, such as dyslexia, and limited mental agility need web pages that are written in straightforward language and are easy to scan. Following these principles and best practice provides benefits for everyone who uses the website.
- Selective disturbance – people prone to epileptic seizures, and those with visual impairments, may be disturbed by flickering and flashing text or images.