Transient content that appears on hover or focus, which must be dismissible, hoverable, and persistent while being hovered.
Design that allows users to cancel or undo pointer actions to prevent accidental activation.
Inputs from motion, orientation, or location sensors. Provide alternatives that do not require device motion.
Mechanisms such as skip links and landmarks that let users jump past repeated content directly to main sections.
Single‑letter keyboard shortcuts that must be remappable, turned off, or only active on focus to prevent accidental activation.
Numeric ratio expressing luminance difference between two colors. Common thresholds: 4.5:1 for normal text, 3:1 for large text or UI.
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