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html introduces css method

May 09, 2023 am 09:33 AM

In web design, HTML (Hypertext Markup Language) and CSS (Cascading Style Sheets) are two basic components. They are combined to create various complex web page layouts, styles and interactive effects. In order to introduce CSS styles in HTML, here are several simple methods.

Internal style sheet

The internal style sheet embeds the CSS code directly into the HTML code. This method is suitable for situations where only one web page needs to introduce CSS styles. The usage is as follows:

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
  &lt;title&gt;内部样式表&lt;/title&gt;
  &lt;style&gt;
    body {
      font-family: Arial;
      background-color: #f2f2f2;
    }
    h1 {
      color: #00bfff;
      text-align: center;
    }
  &lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
  &lt;h1&gt;内部样式表示例&lt;/h1&gt;
  &lt;p&gt;这是一段示例文本。&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;

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You can see that the style code in the above HTML code is written in the <style> within the <head> tag. in the label. This style sheet will be applied to all page elements.

External style sheet

External style sheet stores CSS code separately in a CSS file, and this file needs to be introduced in HTML. This method is more suitable for situations where multiple web pages need to share the same CSS style. The usage method is as follows:

Create a CSS file, for example named style.css, and then write the following style code:

body {
  font-family: Arial;
  background-color: #f2f2f2;
}
h1 {
  color: #00bfff;
  text-align: center;
}

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Then in the <head># of the HTML file In the ## tag, use the <link> tag to link the CSS file to the HTML file:

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
  &lt;title&gt;外部样式表&lt;/title&gt;
  &lt;link rel=&quot;stylesheet&quot; href=&quot;style.css&quot;&gt;
&lt;/head&gt;
&lt;body&gt;
  &lt;h1&gt;外部样式表示例&lt;/h1&gt;
  &lt;p&gt;这是一段示例文本。&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;

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As you can see, the above HTML code uses

Inline style sheet adds CSS styles directly to the

style attribute in the HTML tag. This approach is useful when only specific page elements require special styling. The usage method is as follows:

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
  &lt;title&gt;内联样式表&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
  &lt;h1 style=&quot;color: #00bfff;text-align: center;&quot;&gt;内联样式表示例&lt;/h1&gt;
  &lt;p&gt;这是一段示例文本。&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;

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As you can see, the

<h1> tag in the above HTML code sets a specific style through the style attribute. This style only will be applied to this specific page element. It should be noted that inline styles are generally not conducive to improving the overall performance management and maintenance of the code.

Summary:

This article introduces three methods of introducing CSS into HTML: internal style sheets, external style sheets and inline style sheets. Each method is suitable for different scenarios, and developers need to choose which method to use based on the specific situation to improve the readability and maintainability of the code.

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