There are several ways to reference CSS in HTML, including inline styles, internal style sheets, and external style sheets. Below I'll explain each method in detail.

1. Inline style:
   Inline style is written directly inside the HTML element and is defined through the style attribute. This method is suitable for style definition of a single element and is not recommended for widespread use in large projects because it can make the HTML code cluttered and difficult to maintain.

<p>这是一段红色的文本。</p>

2. Internal style sheet:
   The internal style sheet is placed within the

   tag of the HTML document and is defined using the

nbsp;html>  
  
  
    
  
  
  <p>这是一段红色的文本。</p>  
  

3. External style sheet:
   An external style sheet is an independent CSS file that is referenced in the HTML file through the tag. This is the most recommended method because it keeps style and content separated, improving code maintainability. At the same time, external style sheets can be referenced in multiple HTML files to achieve code reuse.

Suppose we have a CSS file named styles.css with the following content:

p {  
  color: red;  
}

The code that references the CSS file in the HTML file is as follows:

nbsp;html>  
  
  
    
  
  
  <p>这是一段红色的文本。</p>  
  

In the above code, the href attribute specifies the path to the CSS file. If the CSS file and HTML file are in the same directory, you can use the file name directly. If they are not in the same directory, you need to provide a relative path or an absolute path.

To summarize, the methods for HTML to reference CSS include inline styles, internal style sheets and external style sheets. Among them, external style sheets are the most recommended method because it helps improve the maintainability and reusability of the code.

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