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Is CSS-in-JS better than CSS?

CSS-in-JS has been gaining popularity among web developers, but is it really better than traditional CSS? This question has sparked a debate in the web development community, and each side has its own arguments to support their claim.

On one hand, CSS-in-JS proponents argue that it offers better modularity, encapsulation, and maintainability by allowing developers to write CSS in JavaScript. On the other hand, traditional CSS advocates argue that it allows for separation of concerns and easier debugging. Let’s dive deeper into this topic and explore the advantages and disadvantages of both approaches.

Why We Abandoned CSS-in-JS: A Critical Evaluation

In recent years, there has been a growing trend in web development to use CSS-in-JS libraries like Styled Components or Emotion. These libraries promise to make styling more modular, easier to maintain, and more performant. However, after using CSS-in-JS extensively on several projects, we have come to the conclusion that it is not the best solution for all situations.

The Promise of CSS-in-JS

CSS-in-JS libraries offer several advantages over traditional CSS:

  • Modularity: CSS-in-JS allows you to encapsulate styles within a component, making it easier to reason about and maintain.
  • Dynamic Styling: With CSS-in-JS, you can easily change styles based on props or state, allowing for more dynamic UIs.
  • Performance: By eliminating the need for separate CSS files, CSS-in-JS can reduce the time it takes to load a page.

The Problems with CSS-in-JS

Despite these advantages, we have found several issues with CSS-in-JS:

  • Learning Curve: While CSS-in-JS libraries are designed to be easy to use, there is still a learning curve involved in getting up to speed with the syntax and features.
  • Debugging: Debugging styles in CSS-in-JS can be more difficult than in traditional CSS. With traditional CSS, you can use browser dev tools to inspect styles and see where they are coming from. With CSS-in-JS, styles are dynamically generated at runtime, making it harder to track down issues.
  • Specificity: Because styles are encapsulated within a component, it can be difficult to override styles from parent components. This can lead to issues with specificity.
  • Performance: While CSS-in-JS can improve performance in some cases, it can also have a negative impact on performance if not used carefully. Generating styles at runtime can add overhead and lead to slower rendering times.

Our Decision

After evaluating the pros and cons of CSS-in-JS, we have decided to abandon it in favor of traditional CSS for most projects. While CSS-in-JS can be useful in certain situations, we have found that the advantages are often outweighed by the disadvantages. In particular, we have found that traditional CSS is easier to debug and leads to fewer performance issues.

That being said, we acknowledge that CSS-in-JS can be a valuable tool in certain situations, such as when building highly dynamic UIs or when working with CSS frameworks that don’t play well with traditional CSS. Ultimately, the decision of whether to use CSS-in-JS or not depends on the needs of the project and the preferences of the development team.

CSS vs JS Performance: Which is Faster for Web Development?

In the world of web development, CSS and JavaScript (JS) are two essential tools used to make websites visually appealing and interactive. Both CSS and JS have their unique features and benefits, but when it comes to performance, the question arises: which is faster?

CSS Performance

CSS or Cascading Style Sheets is used to control the look and formatting of a website. It allows developers to separate the website’s content from its presentation, making the code more organized and easy to maintain. CSS is known for its speed and efficiency in rendering web pages. It loads quickly, and the browser can cache it for faster loading times on subsequent visits.

Additionally, CSS has a low impact on the website’s overall performance. It does not require a lot of processing power to run, making it an ideal choice for designing responsive websites that can adapt to different screen sizes.

JS Performance

JavaScript or JS is used to add interactivity and dynamic features to a website, such as animations, pop-ups, and form validation. While JS can enhance the user experience, it comes at a cost of performance. JS requires more processing power to run and can slow down the website’s loading times.

However, there are ways to optimize JS performance, such as compressing the code, minimizing HTTP requests, and using asynchronous loading to load JS files only when needed. These techniques can significantly improve the website’s speed and performance.

Which is Faster?

The answer to this question is not straightforward. Both CSS and JS have their unique strengths and weaknesses when it comes to performance. However, in general, CSS is faster than JS because of its lower impact on the website’s overall performance. CSS is also more lightweight and can load quickly, making it an ideal choice for designing responsive websites.

That being said, JS can still be optimized for speed and performance. By using techniques like code compression, minimizing HTTP requests, and asynchronous loading, developers can significantly improve the website’s speed and performance.

Unlocking the Benefits of CSS-in-JS: A Comprehensive Guide

With the growing popularity of React, the idea of CSS-in-JS has been gaining traction in the web development community. It’s a way to write CSS code that is scoped to a specific component, making it more modular and easier to maintain. In this comprehensive guide, we’ll take a deep dive into the benefits of CSS-in-JS.

What is CSS-in-JS?

CSS-in-JS is a technique that allows you to write CSS code in JavaScript files. This means that the styles are scoped to a specific component, making it easier to manage and maintain. Instead of having a separate CSS file for each component, you can keep everything in one place.

The Benefits of CSS-in-JS


One of the biggest benefits of CSS-in-JS is its modularity. With traditional CSS, it’s easy to create global styles that affect the entire page. This can lead to conflicts and unintended consequences. With CSS-in-JS, you can keep your styles scoped to a specific component, making it easier to manage and maintain.


CSS-in-JS can also improve performance. By keeping your styles scoped to a specific component, you can avoid unnecessary style calculations. This can lead to faster page load times and a better user experience.

Dynamic Styling

CSS-in-JS also allows for dynamic styling. You can use JavaScript variables and functions to dynamically generate styles based on user input or other factors. This can lead to a more customized and interactive user experience.

Server-Side Rendering

CSS-in-JS is also compatible with server-side rendering. This means that your styles will be rendered on the server and sent to the client as part of the initial HTML response. This can lead to faster page load times and better search engine optimization.

Popular CSS-in-JS Libraries

There are several popular CSS-in-JS libraries to choose from:

  • Styled Components: A popular CSS-in-JS library that allows you to write CSS code as JavaScript components.
  • Emotion: Another popular CSS-in-JS library that allows you to write CSS code as JavaScript components.
  • JSS: A low-level CSS-in-JS library that allows you to write CSS code in JavaScript files.

CSS vs JavaScript Style: Understanding the Key Differences

In the world of web development, CSS and JavaScript are two of the most important tools for creating visually appealing and interactive websites. While both are used for styling web pages, there are some key differences between the two that developers should understand.

CSS: Cascading Style Sheets

CSS is a style sheet language used for describing the presentation of a document written in HTML. It separates the content of a web page from its presentation, making it easier to create a consistent look and feel across multiple pages. CSS is primarily used for styling text, fonts, colors, backgrounds, and layout.

One of the main benefits of CSS is that it allows developers to create responsive designs that adapt to different screen sizes and devices. CSS also supports animations and transitions, which can be used to add subtle or complex effects to web pages. Additionally, CSS can be used to create print-friendly versions of web pages, making it easier to generate PDFs and other documents.

JavaScript: Dynamic Web Pages

JavaScript is a programming language used for creating dynamic web pages and web applications. Unlike CSS, JavaScript can be used to manipulate the content of a web page in real-time, allowing developers to create interactive features like drop-down menus, pop-ups, sliders, and more.

JavaScript is often used in conjunction with CSS and HTML to create more complex web applications. It is also used for data validation, form submission, and server-side programming. One of the main benefits of JavaScript is that it can be used to create web pages that respond to user input, allowing for a more personalized and engaging user experience.

The Key Differences

While CSS and JavaScript are both used for styling web pages, they have some key differences that developers should be aware of. Here are some of the main differences:

  • Functionality: CSS is primarily used for styling the presentation of a web page, while JavaScript is used for creating dynamic and interactive features.
  • Syntax: CSS uses a declarative syntax, meaning that developers define the styles they want to apply to a web page. JavaScript uses an imperative syntax, meaning that developers write code that tells the browser what actions to take.
  • Browser Support: CSS is supported by all modern web browsers, while some older browsers may not support newer CSS features. JavaScript is also supported by all modern web browsers, but some users may have it disabled for security reasons.
  • Performance: CSS is generally faster than JavaScript because it is applied directly to the page without requiring any scripts to be executed. However, JavaScript can be optimized for performance by minimizing the number of DOM manipulations and using efficient algorithms.

CSS-in-JS and CSS both have their own benefits and drawbacks, and the choice between the two ultimately depends on the specific needs and preferences of the project and development team. While CSS-in-JS offers advantages such as easier code organization and the ability to easily share styles between components, it may also introduce additional complexity and require a learning curve for developers. On the other hand, CSS is a well-established technology with a large community and a wide range of tools and resources available. Ultimately, it is up to the development team to weigh the pros and cons and make an informed decision based on their specific project requirements.

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