Assistive technology
Hardware or software a person uses to do what a standard setup makes hard, such as a screen reader or a switch.
Assistive technology is any device or program that helps a person use a computer or phone in a way the standard setup does not support. Screen readers, screen magnifiers, braille displays, switch devices, voice control, and alternative keyboards are all assistive technology. So are everyday features such as captions and larger text.
For a website, the important point is that assistive technology reads your page through the browser’s accessibility tree, not through the pixels on the screen. Real text, labeled controls, and sensible structure are what make a page work with all of it at once. WCAG’s fourth principle, robust, is about staying compatible with these tools as they change.
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