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dark-mode-implementation

Implement accessible dark mode with CSS variables and system preference detection.

2|Updated Mar 21, 2026
Search Tags:#accessibility#theme#dark-mode#css-variables#prefers-color-scheme#FOUC
One-click install
npx skills add https://github.com/coastdigitalgroup/coastai-skills --skill dark-mode-implementation-coastdigitalgroup
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: dark-mode-implementation
Source: https://github.com/coastdigitalgroup/coastai-skills/tree/main/website-development/dark-mode-implementation
Command: npx skills add https://github.com/coastdigitalgroup/coastai-skills --skill dark-mode-implementation-coastdigitalgroup

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Solves the problem of implementing accessible dark mode with system preference awareness and no flash of unstyled content.

Core Features & Use Cases

  • CSS variable driven theme architecture for light/dark modes.
  • System preference detection with optional manual override and WCAG-compliant contrast.
  • Easy integration with a blocking initialization script to prevent FOUC and a simple toggle UI.

Quick Start

Set up a blocking head script to apply the user's theme preference on load and wire a toggle to switch between light and dark themes.

Frequently Asked Questions about dark-mode-implementation

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

FAQPage Schema
How do I prevent FOUC when implementing dark mode?▼

To prevent FOUC in dark mode, use a blocking initialization script in the document head to apply the user's theme preference before the page renders. This ensures the correct color scheme loads immediately without any flickering.

How do I detect system color scheme preferences for theme switching?▼

Detect system color scheme preferences using the prefers-color-scheme CSS media query. This allows your web project to automatically switch between light and dark themes based on OS settings, while supporting optional manual overrides for user persistence.

What is the best way to structure CSS variables for light and dark themes?▼

Structure CSS variables for light and dark themes by defining semantic color tokens that change values based on the active theme attribute. This architecture ensures consistent color semantics across UI components during seamless theme switching.

Does dark mode implementation support WCAG-compliant contrast?▼

Yes, accessible dark mode implementation supports WCAG-compliant contrast. The theme architecture is designed to ensure both light and dark color palettes meet accessibility requirements for sufficient contrast ratios across UI components.

How do I add a dark mode toggle UI to my website?▼

Add a dark mode toggle UI by wiring a simple switch element to your CSS variable-based theme architecture. The toggle updates the theme attribute, triggering the blocking script to apply the new state and optionally persist the user preference.

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