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Important Terms

While some terms are defined in place, the following definitions are used throughout this document.

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Assistive Technologies
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Hardware and/or software that:

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  • relies on services provided by a user agent to retrieve and render Web content
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  • works with a user agent or web content itself through the use of APIs, and
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  • provides services beyond those offered by the user agent to facilitate user interaction with web content by people with disabilities
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This definition may differ from that used in other documents.

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Examples of assistive technologies that are important in the context + of this document include the following:

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  • screen magnifiers, which are used to enlarge and improve the visual readability of rendered text and images;
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  • screen readers, which are most-often used to convey information through synthesized speech or a refreshable Braille display;
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  • text-to-speech software, which is used to convert text into synthetic speech;
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  • speech recognition software, which is used to allow spoken control and dictation;
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  • alternate input technologies (including head pointers, on-screen keyboards, single switches, and sip/puff devices), which are used to simulate the keyboard;
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  • alternate pointing devices, which are used to simulate mouse pointing and clicking.
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Accessible Description

An accessible description provides additional information, related to an interface element, that complements the accessible name. The accessible description might or might not be visually perceivable.