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May 29, 2023 pm 12:16 PM

CSS Steps Detailed Explanation

CSS (Cascading Style Sheets) is a technology that makes web design simpler, more flexible, and more beautiful. When designing web pages using CSS, there are some basic steps that need to be followed. These basic steps will be introduced in detail below.

Step one: Prepare a text editor

Before using CSS for web design, we need to prepare a text editor. A text editor is a tool used to write HTML, CSS or other program code, such as the common Sublime Text, Visual Studio Code, etc. Choose a text editor that suits you and prepare.

Step 2: Create HTML files

The basis of web pages is HTML (Hypertext Markup Language), so you need to create HTML files in a text editor. An HTML file is a text file with the extension .html. HTML files contain the content and structure of web pages.

Step 3: Add CSS styles

Add CSS styles in HTML files. You can add CSS styles in three different ways:

Inline styles Table

You can use the style attribute inside an HTML element to define CSS styles. For example:

<p style="color: red;">我是一段红色的文本。</p>

Internal style sheet

You can use the <style></style> tag at the head of the HTML file to define CSS styles. For example:

<head>
  <style>
    p {
      color: red;
    }
  </style>
</head>

External style sheet

You can create a separate CSS file and use the <link> tag at the head of the HTML file to import the file. For example:

<head>
  <link rel="stylesheet" href="styles.css">
</head>

Step 4: Selector

When adding a CSS style, you need to use a selector to select the HTML element to which the style needs to be applied. Selectors can select HTML elements by element name, class name, ID, etc.

Element selector

Use the element name as the selector, for example:

p {
  color: red;
}

This CSS style will select all # elements in the entire HTML document ##

Set the label's text color to red.

Use the class name as the selector, for example:

.error {
  color: red;
}

This CSS style will all use the class name in the HTML document The text color of the element that is error is set to red.

Use the ID name as the selector, for example:

#header {
  background-color: gray;
}

This CSS style will use the ID name of the header element The background color is set to gray.

Use the element name combined with the class and ID name as the selector, for example:

p.error {
  color: red;
}

This selector will use The text color of all

tags with the class name error is set to red.

Step 5: Declaration

After the selector, you need to add at least one CSS declaration. A CSS declaration consists of a property and a value. For example:

p {
  color: red;
}

In this example, color is the attribute and red is the value.

Step Six: Inheritance and Cascading

CSS styles have two important features: inheritance and cascading. Inheritance means that an HTML element inherits the styles of its parent element. For example:

<div style="color: red;">
  <p>我是一段红色文本。</p>
</div>

Because the

tag is a child element of the

tag, it will inherit the color of the parent element. Cascading means that multiple CSS styles can be applied to the same HTML element, which will eventually produce a cascaded style. For example:

p {
  color: blue;
}

p {
  color: red;
}

In this example, the final text color of the

tag will be red because the subsequent CSS styles will override the previous styles.

Summary

The above are the basic steps for using CSS for web design. In actual applications, different selectors and declarations should be selected according to the needs of the web page, and appropriate CSS styles should be written according to the inheritance and cascading characteristics.

The above is the detailed content of css steps. For more information, please follow other related articles on the PHP Chinese website!

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