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How to connect css files

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Release： 2023-05-14 20:24:36

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CSS (Cascading Style Sheets) is a language used for web design that can provide the style and layout of web pages. CSS files allow you to easily customize the style of web pages to make them more attractive and readable. In this article, we will explain how to connect CSS files to apply styles in web pages.

1. Inline styles

Inline styles are a way to apply styles directly to web page markup. For example, you can use the style attribute in HTML code to apply styles.

Here is an example of an inline style:

<h1 style="color: red; font-size: 24px;">Hello World!</h1>

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In this example, we use the style attribute to define the color (red) and font size (24 pixels) of the title.

The advantage of inline style is that it is simple and fast. You only need to add the style attribute to the markup. However, when you apply the same style to multiple web pages, you need to write code repeatedly, which leads to code duplication and maintenance difficulty.

2. Embedded styles

Another way to apply styles to web pages is to use embedded styles. At the head of the HTML file, you can create a style element and write style code in it. Here is an example of an embedded style:

<!DOCTYPE html>
<html>
    <head>
        <title>My Page</title>
        <style>
            h1 {
                color: red;
                font-size: 24px;
            }
        </style>
    </head>
    <body>
        <h1>Hello World!</h1>
    </body>
</html>

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In this example, we use the style element to define the color and font size of the title. The advantage of this method is that styles can be written and maintained in the same HTML file, avoiding the trouble of repeatedly writing code. However, if you need to apply the same style across multiple web pages, using inline styles can lead to verbose code and difficult maintenance.

3. External style sheet

Another commonly used way to connect CSS files is an external style sheet. Put the CSS code in a separate file and connect it through the link element in the HTML file. The following is an example of an external style sheet:

Write the style code in the CSS file (style.css) as follows:

h1 {
    color: red;
    font-size: 24px;
}

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Then add the link element in the HTML file:

<!DOCTYPE html>
<html>
    <head>
        <title>My Page</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        <h1>Hello World!</h1>
    </body>
</html>

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In this example, we use the link element to connect HTML files and CSS files. When the browser loads an HTML file, it checks the link element and reads the file path and file name from the href attribute. The browser then downloads the CSS file and applies it to the elements in the web page.

The advantage of using an external style sheet is that the same style can be used in multiple web pages, while making the code more modular and easier to maintain.

Conclusion:

Each of the above three methods has its advantages and disadvantages. Inline styles are simple, but duplication of code may lead to maintenance problems; embedded styles can define styles for multiple elements in the same HTML file, but may lead to verbose code when applying the same style in multiple HTML files; external Style sheets can reuse the same style in multiple HTML files and make the code more modular, but you need to pay attention to the file path and file name.

In practical applications, the appropriate method should be selected according to needs. If you need to apply styles to only a few elements of a web page, you can use inline styles; if you need to apply styles to multiple elements, you can use embedded styles; if you need to apply the same style in multiple web pages, you should use external styles. Style sheet.

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