Jens Oliver Meiert • 7/15/2026

CSS: Deduplicate and Speed Up Your Style Sheets With CSS Dedup

This article explains the UDJO (Using Declarations Just Once) CSS optimization technique, which improves maintainability and performance by deduplicating style declarations. It introduces CSS Dedup, a new tool that automates this process, allowing developers to check for duplication and safely fix it with options like --fix --savings-only or --aggressive. The tool can be used via CLI, programmatically, or as a PostCSS plugin. The article is a technical guide for web developers and CSS optimizers, focusing on performance and code quality.

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#performance #optimization #css