color-accessibility-and-mode

Validate UI color choices for WCAG contrast and light/dark mode support.

6|3|Updated May 3, 2026
One-click install
npx skills add https://github.com/HDeibler/universal-design-principles --skill color-accessibility-and-mode
Or copy as Structured Prompt for Agentโ–ผ
Please help me install this Agent Skill.
Skill: color-accessibility-and-mode
Source: https://github.com/HDeibler/universal-design-principles/tree/main/plugins/perception-and-hierarchy-principles/skills/color-accessibility-and-mode
Command: npx skills add https://github.com/HDeibler/universal-design-principles --skill color-accessibility-and-mode

SYSTEM DOCUMENTATION & REQUIREMENTS

๐Ÿ’ก This Skill includes references (resource) components.

What problem does it solve?

This skill helps you create color systems that remain readable and compliant across WCAG requirements, color-blindness conditions, and user-controlled display preferences like dark mode and high-contrast/forced-colors.

Core Features & Use Cases

  • WCAG contrast validation: guides you to check and achieve AA/AAA contrast for body text, large text, and non-text UI elements.
  • Color-blindness resilient signaling: prevents relying on red/green hue alone by using additional cues like text, icons, or patterns.
  • Mode parity (light/dark): avoids naive inversion and recommends tuned dark-mode neutrals, saturation adjustments, and rechecking contrast in both schemes.
  • High-contrast and forced-colors support: ensures usability when OS/browser accessibility modes override page colors and hide backgrounds.
  • Motion/transition safety: reduces risk from rapid color/flash transitions and supports prefers-reduced-motion.

Quick Start

Use this skill when auditing or selecting text and UI colors for an interface that must support dark mode, high-contrast preferences, and color-blind accessibility, and ask it to produce an accessibility-aware palette and a checklist of required contrast validations.

Frequently Asked Questions about color-accessibility-and-mode

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate WCAG color contrast for UI elements in both light and dark mode?โ–ผ

To validate WCAG color contrast across light and dark mode, audit text, non-text UI elements, and state colors against AA/AAA ratios. Avoid naive color inversion by tuning dark mode neutrals and rechecking contrast to ensure palette parity.

What is the best way to design UI colors that remain accessible for color blindness?โ–ผ

Designing UI colors for color blindness requires avoiding red/green hue-only differentiation. Resilient signaling combines color with text, icons, or patterns to convey status, preventing reliance on hue alone for critical UI state information.

How do forced colors and high-contrast preferences affect my web interface palette?โ–ผ

Forced colors and high-contrast preferences override page colors and hide backgrounds to ensure usability. Your color system must support these OS/browser accessibility modes by providing robust focus states and maintaining structure without relying solely on backgrounds.

Can I use this approach to audit existing UI color systems for accessibility compliance?โ–ผ

Yes, you can audit existing UI color systems to check compliance. The process evaluates text, controls, focus states, and status colors against WCAG requirements, producing an accessibility-aware palette and a checklist of required contrast validations.

Why does inverting colors for dark mode break my interface's accessibility?โ–ผ

Inverting colors for dark mode often breaks accessibility because direct inversion ignores saturation adjustments and contrast shifts. A compliant dark mode requires tuned neutral colors and a full recheck of both text and non-text contrast ratios.

What WCAG contrast ratios do I need to meet for non-text UI components?โ–ผ

Non-text UI components must meet specific WCAG contrast ratios against adjacent colors. Validating non-text contrast for controls, focus states, and boundaries ensures interface elements remain visible and operable alongside standard body and large text requirements.