Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Occlusion(also: Hand Occlusion, Finger Occlusion, Visual Occlusion)
- In the context of touchscreen and pen-based interaction, occlusion refers to the user's hand or finger blocking their view of content on the screen while interacting with it. Occlusion is a significant accessibility barrier, particularly for older adults and users with motor…
- On-Demand Simplification(also: On-demand text simplification, User-initiated simplification)
- An interaction pattern for Automatic Text Simplification reading-assistance tools in which the user explicitly requests a simpler version of a word, phrase, or sentence — typically via hover, click, or tap — rather than having the system pre-apply simplifications to the page…
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