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What is File Splitting ?

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  • Last Updated : 29 Sep, 2022
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File Splitting is the technique of breaking a large single file into many files so that each individual can work on a specific file is known as file splitting. This improves efficiency and makes it easy to work.

Basically, it is separating your code into multiple files rather than having it all in one. Consider that your website has other three parts: the login page, the main page(Interface), and the registration page. You would include the CSS for the login page in one file, the main CSS in another file, and the registration CSS in a third file. The HTML then refers to an index file that contains instructions on how to use these three files.

Why would you divide your file? Specifically, there are some advantages of dividing a single file into multiple files:

Advantages of dividing your files:

  1. Instead of navigating a large CSS file, the login file, registration file, and main files each include the information for the login CSS, registration CSS, and main page CSS, respectively.
  2. In order to prevent confusion, various files will be neatly organized.
  3. You can open a specific file based on your needs.
  4. This aids in multitasking by allowing many people to work on various files of a single project.
  5. When it comes to large projects, the majority of organizations use this strategy.
  6. Here, the browser may use the rest of the cached files even if only one of them is changed. It should speed up your website.

How to split files?

By designating a specific portion for each CSS file, a single CSS file can be split into many CSS files.

Think about a single main CSS file, for instance, which has style sheets for login and registration. Therefore, we can separate the login style sheets and registration style sheets from the main CSS file rather than having them both in the same file.

Then, we will make two CSS files by adding login style sheets to the login CSS file and similarly adding registration style sheets to the registration CSS file.

Hence, two distinct files would be created for both registration and login and we will have three CSS files in total: the main CSS, the login CSS, and the registration CSS.

How to include multiple CSS files: After splitting those files, it’s important to integrate them into an HTML file.

The simplest method is to create your individual files first, then link each one individually, just like you do with any other file.

<link rel=”stylesheet” type=”text/css” href=”login.css” />
<link rel=”stylesheet” type=”text/css” href=”main.css” />
<link rel=”stylesheet” type=”text/css” href=”registration.css” />

All these three CSS files are included in a single HTML file.

CSS Architecture:

Have you ever found it difficult to maintain CSS style consistency? JavaScript functionality can be affected by even minor CSS modifications. But with careful preparation at the start of the project, these issues can be avoided.

A strong CSS architecture allows for easy expansion. Any project’s development faces the difficulty of scalability. Because CSS doesn’t include the ideas of variables, functions, abstract mechanisms, or module mechanisms, it is an extremely strong language for writing styles.

But it also has negative effects on writing effectiveness, code maintenance, and reusability. As a result, it is relatively simple to comprehend and pick up, yet challenging to master.

For instance, different selector types such as ID selectors, class selectors, element selectors, etc. Have varying weights, which makes it simple for styles to overlap and clash. It’s referred to as global pollution. Differentiating class names can prevent global conflicts, but doing so will make class naming more complicated.

CSS File Organization:

File organization is a key component of a solid CSS architecture. For solitary developers or really small applications, a single file is acceptable. For big projects with multiple layouts and content categories, or multiple brands under the same design framework it’s to use a modular approach and separate your CSS across multiple files.

It is simpler to assign work to teams when your CSS is split among multiple files. While another developer focuses on creating grid components, the first can work on typography-related styles etc. Teams can boost overall productivity by intelligently dividing the tasks.

Several established methods are available for formatting your CSS and some of them are :-

1. BEM (Block, Element, Modifier):

BEM is a very helpful, strong, and straightforward naming convention to make your front-end code easier to read and comprehend, easier to work with, easier to scale, more robust and explicit, and a lot more strict.


OOCSS aims to promote code reuse, which will lead to quicker, more effective stylesheets that are also simpler to update and manage.

OOCSS is founded on two main pillars:

  • Separation of structure from the skin.
  • Separation of containers and content.


In order to transform those strict frameworks into a flexible thought process, SMACSS provides a means to assess your design approach. It is an attempt to codify a consistent process for creating websites using CSS.

The fundamental component of SMACSS is classification. By grouping CSS rules into categories, we can start to recognize trends and create best practices for each of these trends.

There are five different kinds of categories:

  • Base: Reset and default element styles are included in Base. It may also provide default styles for controls like buttons, grids, and other elements that, in some cases, can be changed later on in the text.
  • Layout: The layout would include all of the menus, breadcrumbs, sitemaps, etc.
  • Modules: Modules contain region-specific designs for contact forms, homepage tiles, product listings, etc.
  • State: State includes state classes like “WasSuccessful,” “hasError,” “isSelected,” and “isActive.”
  • Theme: Any styles connected to themes are included in the theme.

4. Don’t Repeat Yourself CSS (DRY CSS):

  • Group reusable CSS properties together.
  • Name these groups logically.
  • Add your selectors to the various CSS groups.


  1. Our site would take significantly longer to load because of the number of HTTP queries we’d need to call multiple files.
  2. Cost of transferring more bytes than are required to produce the page.

Conclusion: Therefore, up to this point, we have covered CSS file splitting, its architecture, and file organization. However, it’s necessary to be aware of some drawbacks associated with file splitting.

Also, knowing CSS architecture and file organization can help you understand the numerous ways that several files are integrated together.

As a result, it’s essential to understand CSS file splitting, as well as its benefits and drawbacks.

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