HTML (Hypertext Markup Language) and CSS (Cascading Style Sheets) are two languages ​​commonly used in web development. HTML is responsible for structure and content, and CSS is responsible for style and layout. They are closely related and can be said to complement each other.

HTML defines the structure and content of web pages. In HTML, markup is used to identify different web page elements, such as titles, paragraphs, images, links, etc. These tags are represented by angle brackets, for example:

这是一个标题
这是一个段落

这是一个链接

But HTML does not specify the style and layout of these elements. This is the job of CSS.

CSS can be used to define styles and layouts for elements in HTML. For example, CSS can be used to define the color, font, size and other attributes of the title:

h1 {
  color: red;
  font-family: Arial, sans-serif;
  font-size: 2em;
}

In addition, CSS can also control the position, size, border, etc. of elements. For example, CSS can be used to define the borders, padding, and margins of a paragraph:

p {
  border: 1px solid black;
  padding: 20px;
  margin-bottom: 10px;
}

CSS can be combined with HTML in different ways, including inline (inner), outer, and inline styles. Embedded styles exist within HTML tags, like this:

这是一个标题

External styles store CSS code in a separate file and link it into the HTML page, like this:

  
  



  
这是一个标题
  
这是一个段落

Inline styles define CSS code directly in HTML elements:

这是一个标题

This method is not recommended because it will increase the complexity of HTML.

To sum up, HTML and CSS are two closely related languages, which together form the basis of web development. HTML is used to define the structure and content of web pages, and CSS is used to define the style and layout of web pages. Good HTML and CSS coding practices can greatly improve the quality and user experience of your web pages.

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