Paul Armstrong • 11/21/2022

Using client hints to prevent FARTs with website auto dark mode themes

This article explains the 'Flash of inAccurate coloR Themes' (FART) problem, where websites briefly show a light theme before switching to dark mode. It details a solution using HTTP client hints and server-side processing (inspired by Jason Lengstorf) to eliminate the flash. The guide includes implementation steps for a theme switcher with 'auto' mode support, using Tailwind CSS (with darkMode: 'class'), and integrating client hints to respect the user's system preference without a jarring visual shift.

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#performance #dark-mode #Theme Switching