What are the Benefits to Separate HTML, CSS, and JavaScript?

Introduction

This article teaches the benefits of separating HTML, CSS, and JavaScript files. So it provides to easily understandable, easy to maintain and some other benefits its have we learn one by one.

Firstly we understand where we write HTML, CSS, and JAVASCRIPT then we easily relate what benefits of creating separate files for each.

Where do we write HTML Code?

We write Html code in any editor like Notepad with an extension .html file. Below the example, we can see clearly how to save HTML file with an extension in Notepad.

HTML

Where do we write CSS Code?

There are three methods to write CSS code.

Internal CSS
Inline CSS
External CSS

Internal CSS

In internal CSS, we write a head section in html between <style> elements. In this method, we can not create separate files to write CSS code, we write HTML files in the head section.

Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
/* Here we write css code.*/
    </style>
</head>
<body>
    
</body>
</html>

Inline CSS

In this method, CSS uses the style attribute of an html code, Which means this method applies individual apply html attributes. This method is very popular in the web development field, but when we have a large amount of data, then this method applies very difficult that's why external CSS is introduced.

Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>first project by Harshit</title>
</head>
<body>
    <h1 style="text-align: center;">Introduction</h1>
</body>
</html>

In this html code, we apply inline css in the heading attribute with a style element.

External CSS

In the above, we see inline and internal css, In external CSS, we create separate files for css with the .css extension. This is very popular in the web development field, it provides an easy understanding of code, unlike inline and external css. We link html file to css file with the link attribute in html.

Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>first project by Harshit</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <h1>Introduction</h1>
</body>
</html>

In this example, we link css file with the link attribute of html and css file name style.css, and that file is in the same folder.

Where do we write JavaScript code?

We write JavaScript code in three different methods available In head tag, In body tag, and External JavaScript file.

Using Head Tag

In this method, we write JavaScript code in the head section in html code using <script> element to writing JavaScript code

Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>first project by Harshit</title>
    <script>
 // here we write javascript code
    </script>

</head>
<body>
    <h1>Introduction</h1>
</body>
</html>

Using Body Tag

In this method, we write JavaScript code in the body section in html code using <script> element to write JavaScript code.

Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>first project by Harshit</title>
</head>
<body>
    <h1>Introduction</h1>
    <script>
        // here we write javascript code
    </script>
</body>
</html>

Using External files to write javascript

In this method, we create a separate file for JavaScript code, this provides easily understandable code and less ambiguous conditions to understand code. We link JavaScript code to html code with <script src=""></script> attribute and that JavaScript file extension is .js

Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>first project by Harshit</title>
</head>
<body>
    <h1>Introduction</h1>
    <!--This is external file of javascript-->
    <script src="firstjavascript.js"></script>
    
</body>
</html>

We learn where we write HTML, CSS, and JavaScript code, So when we write all code in one file, then is very difficult to maintain and understand other people of this code.

Main Benefits of separating HTML, CSS, and JavaScript

Separating HTML, CSS, and JavaScript into different files has several benefits, including:

Better readability: Separating the different aspects of your code into separate files makes it easier to organize and maintain your code. You can make changes to one file without affecting the others and easily find and edit specific parts of your code when needed. It is also easier to read and understand code.
Improved website performance: Separating your CSS and JavaScript from your HTML allows browsers to cache these files separately, which can improve page loading times. This is because the browser only needs to download and parse the HTML file once, while it can reuse the cached CSS and JavaScript files on subsequent page views.
Easier collaboration: Separating your code into different files can make collaborating with others on a project easier. Different team members can work on different parts of the codebase without conflicting with each other.
Increased maintainability: When you separate your HTML, CSS, and JavaScript, it becomes easier to maintain and update your code over time. You can make changes to your CSS and JavaScript without affecting your HTML, and you can update your HTML without having to worry about breaking your CSS or JavaScript.
Better debugging and error handling. Separating files may help better debug your JS code and also easy to fix bugs. By following best practices of logging and error handling, you can easily track bugs and errors.

Conclusion

We learn the benefits of separating all HTML, CSS, and JavaScript files and where we write HTML, CSS, and JavaScript code. Then we easily relate what benefits come to sperate all files,

It is very important to separate all their files because it provides easy understanding, and other developers can easily relate to the code.