Glossary
Searchable terminology from accessibility, web standards, and related fields.
6 results found in visual design.
- CSS Box Model (Box Model)
- A fundamental concept in CSS that describes how HTML elements are rendered as rectangular boxes with four distinct areas: content (the actual text or image), padding (space between content and border)…
- Color Contrast (Colour Contrast, Contrast Ratio)
- The difference in luminance between foreground text (or UI components) and their background, measured as a ratio. WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large …
- Editorial Enunciation (Visual Enunciation)
- A semiotic concept describing how the visual layout and organisation of an interface communicates meaning beyond the content it contains. Editorial enunciation encompasses the spatial arrangement, siz…
- Legibility
- The visual clarity with which individual characters, words, and blocks of text can be distinguished and recognised. Legibility is influenced by font choice (sans-serif fonts are generally more legible…
- Luminance (Relative Luminance)
- The relative brightness of a color as perceived by the human eye, measured on a scale from 0 (black) to 1 (white). In accessibility, relative luminance is the foundation of WCAG color contrast ratio c…
- Tiresias (Tiresias Screenfont, Tiresias Font Family)
- A family of typefaces developed in 1998 by the Royal National Institute of Blind People (RNIB) specifically designed for legibility on screen displays, particularly television subtitling. Named after …