Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- HTML(also: HyperText Markup Language)
- The standard markup language used to create and structure content on the World Wide Web. HTML uses elements (tags) to define the semantic structure of documents, including headings, paragraphs, links, lists, tables, forms, and images. Proper use of semantic HTML is fundamental…
- HTML Canvas(also: Canvas API, Canvas Element)
- An HTML element used to draw graphics on a web page via JavaScript, rendering content as a bitmap image rather than as structured DOM elements. Unlike SVG, canvas content is not inherently accessible to screen readers because it produces a flat pixel surface with no semantic…
- HTML Frame(also: Frame, Frameset, IFrame)
- An HTML element that divides a web page into multiple independent sections, each displaying a separate document. Framesets (using the frame and frameset elements) split the browser window into distinct panes, while inline frames (iframe) embed one document within another. Frames…
- HTML Table(also: Data Table, Web Table)
- An HTML table is a structured element in web markup used to organize data into rows and columns. Tables are created using the table, tr (table row), th (table header), and td (table data) elements. For accessibility, data tables must include proper header markup (th elements…
- Heading hierarchy(also: Heading structure, Heading levels)
- The logical, nested structure of HTML heading elements (h1 through h6) that organizes web content into a navigable outline. A well-structured heading hierarchy uses heading levels sequentially without skipping levels, with a single h1 for the page title, h2 for major sections,…
- Heading hierarchy(also: Heading structure, Heading levels, Document outline)
- The logical structure created by using HTML heading elements (h1 through h6) in a nested, hierarchical order to convey the organisation of content on a web page. A proper heading hierarchy starts with a single h1 for the page title, with h2 elements for major sections, h3 for…
- Hijax(also: Progressive enhancement with Ajax)
- A web development approach coined by Jeremy Keith that applies progressive enhancement principles to Ajax applications. Hijax starts with a fully functional, accessible HTML page and then layers Ajax functionality on top, so that the site degrades gracefully when JavaScript is…
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