Offer a high contrast theme that boosts legibility for users with low vision.
Use near-black/near-white pairs; text/background ≥7:1 where possible. Ensure state colors also pass AA/AAA.
Provide explicit tokens for high-contrast mode to avoid accidental regressions.
UI & Toggle Placement
Add a toggle in settings and header utility. Label clearly (“High contrast”).
Use aria-pressed and visible focus. Allow quick revert.
Persistence & Defaults
Persist choice in localStorage/profile; respect OS high-contrast signals when available.
Apply instantly on load to avoid flashes.
Frequently asked questions
What is the purpose of a high contrast mode option?
Accessibility & Components
How should I ensure all UI components are accessible within a high contrast theme?
Audit all components: buttons, inputs, tables, charts, focus outlines, links, badges. Avoid relying on color alone; add underlines/patterns.
What accessibility testing methods should be used to verify the high contrast mode?
Use axe/Lighthouse; manual checks with low-vision settings. Verify all states (hover/focus/active/disabled), images/icons without halos, and chart/tooltips readability.
How does the high contrast mode relate to copyright information?
© 2024 AI Usage by Countries. High contrast mode option.
▶ Try it live
Everything above runs in your browser — open Hash Function Avalanche Visualizer and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.