Glossary

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Tab Order(also: Focus Order, Navigation Order, Tabbing Order)

The sequence in which interactive elements receive keyboard focus when a user presses the Tab key to navigate through a web page or application. A logical tab order follows the visual layout and task workflow, allowing keyboard-only users to interact with content efficiently.…

Text Alternative(also: Alt Text, Alternative Text, Text Equivalent)

A textual replacement for non-text content, primarily images, that conveys the same purpose or information as the visual element. Text alternatives are essential for users who cannot perceive images, including people who are blind or have low vision and rely on screen readers.…

Text Alternatives(also: Text Alternative, Text Equivalent)

WCAG 2.1 Guideline 1.1 and success criterion 1.1.1 require that all non-text content (images, charts, audio, video, form controls, etc.) have a text alternative serving the equivalent purpose. Text alternatives can be presented as alt text on an image, an aria-label on a…

Text Reflow(also: Content Reflow, Responsive Text)

The ability of text content to rearrange and wrap within its container when the viewport is resized or text is zoomed, so that users can read without horizontal scrolling. Text reflow is essential for users with low vision who magnify content, as well as for mobile users on…

Time-Based Media(also: Multimedia Content, Synchronized Media)

Content that unfolds over time, including audio, video, audio-video combinations, and interactive multimedia presentations. WCAG Guideline 1.2 requires that time-based media be made accessible through alternatives such as captions for the deaf and hard of hearing, audio…

Touch Target Size(also: Tap Target Size, Target Size)

The physical area of an interactive element on a touchscreen that responds to user input. Adequate touch target sizing is critical for accessibility, particularly for users with motor impairments who may have difficulty precisely tapping small areas. WCAG 2.2 Success Criterion…

Transcripts(also: Transcript, Text Transcript)

A written, text-based representation of spoken audio or audiovisual content. WCAG 2.1 success criterion 1.2.1 (Audio-only and Video-only Prerecorded) requires an alternative for time-based media — typically a transcript — for pre-recorded audio-only content such as podcasts,…

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