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BEM vs CSS Modules: What are the differences?


In web development, there are various approaches to structuring and styling CSS code. Two popular approaches are the Block Element Modifier (BEM) methodology and CSS Modules. This markdown will highlight key differences between BEM and CSS Modules.

  1. Code Organization: BEM focuses on naming conventions to organize code, where each class describes a specific block element or modifier. CSS Modules, on the other hand, uses modularization to encapsulate styles within specific components, providing a more component-based approach.

  2. Namespace Conflicts: BEM uses specific naming conventions that reduce the likelihood of naming conflicts. Each BEM class name is unique and self-contained. CSS Modules generate unique class names for each component, avoiding conflicts by scope, as the styles are locally scoped to the component without the need for long class names.

  3. Dependency Management: BEM usually relies on manual dependency management, where you have to explicitly include all the necessary CSS classes in the HTML markup. CSS Modules, however, automatically handles dependencies by importing and including the required styles in the component file.

  4. Module Reusability: BEM promotes reusability by separating structure and style. Styles can be applied to different elements with the same BEM class, allowing for modular and reusable components. CSS Modules, on the other hand, encapsulate styles within components, often resulting in less reusability as the styles are tighter to the component itself.

  5. Global vs Local Scope: BEM classes have global scope and can be applied to any element within the project. This provides flexibility but can also lead to unintended style conflicts. CSS Modules, on the other hand, have local scope, meaning styles are only applied within the component they are imported into, reducing the chances of style conflicts.

  6. Class Naming Convention: BEM follows a specific class naming convention, where each class represents a block, element, or modifier. This structured naming convention helps developers identify the purpose of each class. CSS Modules do not enforce a specific naming convention, allowing developers more freedom and flexibility in naming classes.

In summary, while BEM focuses on naming conventions and global scope, CSS Modules provide modularization and local scope. BEM promotes reusability through structured class names, while CSS Modules encapsulate styles within components. The choice between BEM and CSS Modules depends on the specific project requirements and the desired approach to code organization and styling.

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Pros of BEM
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    What is BEM?

    This methodology was developed at Yandex with the goals in mind that Fast development and long-lasting results for standard projects,A project involves many people,Scalable teams,Code reuse.

    What is CSS Modules?

    It is a CSS file in which all class names and animation names are scoped locally by default. The key words here are scoped locally. With this, your CSS class names become similar to local variables in JavaScript. It goes into the compiler, and CSS comes out the other side.

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    What companies use BEM?
    What companies use CSS Modules?
    See which teams inside your own company are using BEM or CSS Modules.
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    What are some alternatives to BEM and CSS Modules?
    SUIT CSS provides a reliable and testable styling solution for component-based web application development.
    Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.
    JavaScript is most known as the scripting language for Web pages, but used in many non-browser environments as well such as node.js or Apache CouchDB. It is a prototype-based, multi-paradigm scripting language that is dynamic,and supports object-oriented, imperative, and functional programming styles.
    Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
    GitHub is the best place to share code with friends, co-workers, classmates, and complete strangers. Over three million people use GitHub to build amazing things together.
    See all alternatives