Why Separating Themes from Modes Transforms Your Design System
This title could be clearer and more informative.Try out Clickbait Shieldfor free (5 uses left this month).
Themes and modes are distinct concepts in design systems: themes define color palettes and brand identity, while modes control brightness (light, dark, high-contrast) for accessibility. Mixing them creates compounding complexity at scale. By separating them using CSS custom properties and HTML data attributes (data-theme and data-mode), each concern gets independent control. This architecture means dark mode is defined once and inherited by all products, new themes only require brand colors, and accessibility improvements propagate system-wide automatically. The implementation uses two data attributes on the HTML element, separate CSS variable blocks for themes and modes, and distinct JavaScript functions for switching each.
Table of contents
Understanding the DifferenceWhy This MattersAt Design System Scale - The TransformationHow I've Implemented ItApplying the Variables to ComponentsThe Matrix of PossibilitiesHandling System PreferencesStructuring It AllWrapping Up711 Impressions1 Comment