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How to embed CSS styles in HTML

百草Original: 2023-09-20 11:37:001640browse

The methods for embedding CSS styles in HTML include inline styles, internal style sheets and external style sheets. Detailed introduction: 1. Inline style refers to writing the CSS style directly in the HTML tag and setting the style of the element through the style attribute. The advantage of this method is that it is simple and intuitive, and can quickly set the style for a specific element. But its shortcomings are also obvious. The style is tightly coupled with the HTML structure, making it difficult to maintain and reuse. At the same time, when the style needs to be modified, the entire HTML document needs to be traversed, which is inefficient; 2. Internal style sheets, etc.

HTML There are three main ways to embed CSS styles: inline styles, internal style sheets and external style sheets. Each of these three methods has advantages and disadvantages and is suitable for different scenarios. These three methods will be introduced in detail below.

1. Inline style

Inline style refers to writing the CSS style directly in the HTML tag and setting the style of the element through the style attribute. The advantage of this method is that it is simple, intuitive, and able to quickly style a specific element. However, its shortcomings are also obvious: styles and HTML structures are tightly coupled, making it difficult to maintain and reuse. At the same time, when the style needs to be modified, the entire HTML document needs to be traversed, which is inefficient.

For example, the following code applies inline styles to a paragraph tag:

<p  style="color:  red;  font-size:  16px;">这是一个红色的段落。</p>

2. Internal style sheet

The internal style sheet refers to writing the CSS style in the HTML document The `93f0f5c25f18dab9d176bd4f6de5d30e` part is defined using the `c9ccee2e6ea535a969eb3f532ad9fe89` tag. The advantage of this method is that it is convenient for management and maintenance, can separate styles from HTML structure, and improves code readability. However, its disadvantage is that the style only takes effect on the current HTML document and cannot be reused across pages.

For example, the following code applies an internal style sheet to a paragraph tag:

<!DOCTYPE  html>   
<html>   
<head>   
   <style>   
     p  {   
       color:  red;   
       font-size:  16px;   
     }   
   </style>   
</head>   
<body>   
   <p>这是一个红色的段落。</p>   
</body>   
</html>

3. External style sheet

External style sheet refers to writing CSS styles in a separate CSS file, introduced into the HTML document through the `2cdf5bf648cf2f33323966d7f58a7f3f` tag. The advantage of this method is that it can achieve cross-page reuse and improve the efficiency of style management. At the same time, CSS files can be used for version control and team collaboration. However, its disadvantage is that introducing external files may increase network latency and affect page loading speed.

For example, the following code applies an external style sheet to a paragraph tag:

1. Create a CSS file named `styles.css` with the following content:

p  {   
   color:  red;   
   font-size:  16px;   
}

2. Introduce the CSS file into the HTML document:

<!DOCTYPE  html>   
<html>   
<head>   
   <link  rel="stylesheet"  href="styles.css">   
</head>   
<body>   
   <p>这是一个红色的段落。</p>   
</body>   
</html>

To sum up, the methods for embedding CSS styles in HTML include inline styles, internal style sheets and external style sheets. Choosing the appropriate method based on actual needs and scenarios can improve the maintainability, readability, and efficiency of the code.

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