Glossary

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X3D(also: Extensible 3D, Extensible 3D Graphics)

An ISO-standard XML-based file format and runtime architecture for representing and communicating 3D scenes and objects on the web. X3D is the successor to VRML (Virtual Reality Modeling Language) and is maintained by the Web3D Consortium. In the accessibility context, X3D is…

XForms(also: W3C XForms)

XForms is a W3C specification for web forms that separates the purpose of a form (its data model) from its visual presentation, providing richer semantics than traditional HTML forms. Unlike HTML forms where controls are defined by their visual representation (radio buttons,…

XHTML(also: Extensible HyperText Markup Language, XHTML 1.0, XHTML 2.0)

XHTML (Extensible HyperText Markup Language) is a family of W3C specifications that reformulated HTML as an XML application, requiring stricter syntax rules such as properly nested elements, lowercase tag names, and quoted attribute values. XHTML 1.0, published in 2000, was…

XML(also: Extensible Markup Language)

A markup language designed by the W3C for encoding structured data in a format that is both human-readable and machine-readable. Unlike HTML, which has a fixed set of tags focused on presentation, XML allows authors to define custom tags that describe the meaning and structure…

XPath(also: XML Path Language)

XPath (XML Path Language) is a query language for selecting nodes and computing values from XML and HTML documents. In the context of web accessibility, XPath expressions are used by assistive technologies and accessibility tools to identify and target specific elements within a…

XR Accessibility(also: Extended Reality Accessibility, Immersive Accessibility)

The practice of designing virtual reality (VR), augmented reality (AR), and mixed reality (MR) experiences that are usable by people with disabilities. XR accessibility encompasses challenges across motor, visual, auditory, cognitive, and vestibular domains, including the…

XR Accessibility User Requirements(also: XAUR)

A W3C document that provides accessibility guidelines and user requirements specifically for extended reality (XR) applications, including virtual reality, augmented reality, and mixed reality. XAUR identifies the diverse needs of users with disabilities in XR environments and…

XSLT(also: Extensible Stylesheet Language Transformations, XSL Transformations)

A W3C standard language for transforming XML documents into other formats such as HTML, plain text, or different XML structures. XSLT uses template rules that match patterns in the source XML and produce corresponding output, enabling the separation of content from presentation.…

Xbox Adaptive Controller(also: XAC)

A Microsoft-manufactured game controller designed for players with limited mobility. It provides a large flat-surface form factor with two oversized programmable buttons and 19 external 3.5 mm jacks plus USB ports, so it can be connected to a wide range of external switches,…

Xbox Controller Assist(also: Xbox Copilot)

A Microsoft software feature (formerly called Xbox Copilot) available on Xbox consoles and Windows PCs that links two physical controllers so they behave as a single controller — any input from either pad is treated as if it came from one player. It is explicitly advertised as…

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