BEM (Block Element Modifier)

What is BEM (Block Element Modifier)?

BEM, which stands for Block Element Modifier, is a methodology that helps you to create reusable components and code sharing in front-end development. It is a powerful tool that allows developers to write modular and scalable CSS. This methodology was developed by the team at Yandex and is heavily used in the front-end development community.

Understanding BEM

The BEM methodology splits the design of a website into three components: Blocks, Elements, and Modifiers. They are defined as:

  • Block: It is a standalone entity that is meaningful on its own. For example, a header, container, menu, or footer.
  • Element: It is a part of a block that has no standalone meaning and is semantically tied to its block. For example, a menu item, list item, or a header title.
  • Modifier: It is a flag on a block or element. Use them to change appearance or behavior. For example, disabled, highlighted, checked, fixed, size big, color yellow etc.

Advantages of Using BEM

BEM offers a number of advantages for website designers, developers and administrators. These include:

  • Reusability: Blocks are reusable, which helps in reducing the amount of CSS you have to maintain.
  • Structure: BEM gives your CSS code a solid structure that makes it easier to understand and maintain.
  • Modularity: Modifiers ensure that you can change the style of a component without affecting other components on the page.


In summary, BEM is a powerful tool for web developers that allows for more efficient, flexible, and maintainable code. It’s a methodology that brings a systematic approach to the coding process and can greatly improve the quality of your code.

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