Keyframes duplication is a common issue in web development, especially in projects with component-based architectures. Developers often create multiple definitions for the same animations, like fade-ins or slides, without realizing similar animations already exist in the codebase. This leads to wasted time, unnecessary code bloat, and maintenance headaches. Updating a single animation becomes a tedious task since you have to hunt down every instance across the project. The problem worsens when animations defined in the global scope overwrite each other, causing unpredictable behavior in production environments. To address these challenges, the article proposes a solution: using standardized keyframes tokens stored in a shared stylesheet. By creating a centralized repository for common animations, developers can avoid redundancy and ensure consistent behavior across components. For example, instead of having numerous fade-in animations scattered throughout the code, a single `@keyframes kf-fade-in` can be defined and reused across various components. This not only streamlines the code but also simplifies updates, as changes need to be made in one place. The article also emphasizes the importance of making these keyframes dynamic. By incorporating CSS custom properties, animations can be tailored to specific needs without requiring multiple static definitions. For instance, a single `@keyframes kf-slide-in` can adapt based on a direction specified by a custom property, allowing for versatile slide animations without duplicating code. This approach not only enhances flexibility but also maintains clean and maintainable stylesheets, ultimately improving the development process.