CSS vs. CSS-in-JS: How and why to use each

In the ongoing debate between CSS and CSS-in-JS for styling web applications, the discussion centers around performance issues and the advantages each methodology offers. CSS-in-JS, popular among React developers, addresses scoping problems inherent in traditional CSS by allowing styles to be defined locally within JavaScript, thus preventing global scope conflicts. Despite these benefits, CSS-in-JS faces criticism for delayed rendering, caching issues, lack of preprocessor support, and increased complexity in larger applications. Conversely, CSS Modules offer a more traditional approach, solving scoping issues without the overhead of JavaScript, making them suitable for performance-critical applications. As modern CSS evolves, new features like scoped directives promise to address traditional CSS issues, potentially reducing the reliance on CSS-in-JS solutions. The choice between these methods depends largely on the application size, performance requirements, and the developer's familiarity with JavaScript and CSS.

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