CSS is a computer language that uses style sheets to describe the appearance and format of web pages. It allows developers to easily control the layout, colors, fonts, and many other styles of web pages. In web development, how to correctly introduce CSS is a very important step. In this article, we’ll take a deep dive into the different ways CSS is introduced, as well as their pros and cons.

1. Inline style

Inline style is a method of writing CSS code directly in the style attribute of HTML code. It has the highest priority and can override both external and internal style sheets. However, the way it is used is tedious, cannot be reused, and can clutter the HTML code. Therefore, using inline styles is not recommended in large websites.

2. Internal style sheet

The internal style sheet is to write the CSS code in the head tag of the HTML document and include it using the style tag. This method can make the CSS code better organized, but it is still not intuitive and easy to maintain. Additionally, if you copy the code to another page, you will need to copy the entire code block.

3. External style sheet

An external style sheet puts the CSS code in a separate .css file and introduces it in HTML through the tag. This is the most common way to introduce CSS. The advantage is that it can separate CSS code from HTML files, making it easy to maintain and expand. At the same time, caching can be used to reduce page loading time and improve user experience.

The following is an example of using an external style sheet:

Welcome to my website

This is my first article

In the above code, we use the tag to introduce an external style sheet named "styles.css". Note that the path in the href attribute should point to the actual location of your stylesheet file.

In addition to the above methods, you can also introduce one (or more) style sheets into another style sheet through the @import keyword.

Summary

In web development, the correct way to introduce CSS is very important. Depending on actual needs, you can choose to use inline styles, internal style sheets, or external style sheets. However, external style sheets are the most common method because it makes CSS code better organized, easier to maintain, and easier to extend. When writing CSS code, keep in mind that you should use the least amount of code to achieve the best results.

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