What content does web design css elements include?

CSS (Cascading Style Sheets) are the core elements used to control the appearance and layout of web pages, including: Selectors specify the HTML elements to which styles are to be applied. Properties define the appearance and behavior of elements, such as color, font, and background. The value specifies the specific setting of the property, such as a color code or units. Rule sets combine selectors, attributes, and values ​​to define element styles. Priority determines which rule will be applied, affected by inline style position, definition order, and the !important keyword.

Web Design CSS Elements

CSS (Cascading Style Sheet) is one of the core elements of web design. To control the appearance and layout of web pages. CSS elements include the following:

Selectors

Selectors are used to specify the HTML elements to which styles should be applied. Commonly used selectors include:

• Element selector (p, h1, etc.)
• Class selector (.my-class)
• ID selector (# my-id)
• Wildcard Selector (*)

Attributes

Attributes are used to define the appearance and behavior of an element. CSS contains hundreds of properties, including:

• Color properties (color, background-color)
• Font properties (font-family, font-size)
• Layout attributes (display, float)
• Background attributes (background-image, background-color)

value

value is used to specify The specific setting of the attribute. Values ​​can be colors, numbers, units, or keywords. For example:

• color: red
• font-size: 16px
• margin: 10px

Rule Set

A rule set is a combination of selectors, attributes, and values ​​that are used to define the style of an element. The ruleset uses the following syntax:

<code>选择器 {
  属性: 值;
  属性: 值;
  ...
}</code>

For example:

<code>p {
  color: blue;
  font-size: 16px;
}</code>

This will set blue text and a 16px font size for the paragraph (

) element.

Priority

The priority of a CSS rule determines which rule will be applied. Priority is determined by the following factors:

• Inline styles> Internal style sheets> External style sheets
• Rules defined later> Rules defined earlier
• !important keyword (force application rules)

The above is the detailed content of What content does web design css elements include?. For more information, please follow other related articles on the PHP Chinese website!