What css selectors are there?

css selectors include element selectors, class selectors, ID selectors, attribute selectors, descendant selectors, child element selectors, adjacent sibling selectors and universal selectors. Detailed introduction: 1. Element selector, select HTML elements by element name, for example, use p selector to select all paragraph elements; 2. Class selector, select HTML elements by class name, the class name starts with a dot, for example, use The .class selector can select all elements with a specified class; 3. ID selector, select HTML elements by the unique ID of the element, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

CSS (Cascading Style Sheets) is a language used to describe the styles of elements on web pages. In CSS, selectors are used to select HTML elements to which styles need to be applied. Selectors are one of the most important concepts in CSS, as they determine which elements will be styled.

There are many types of CSS selectors, each with different syntax and uses. The following are some common CSS selectors:

1. Element Selector: Select HTML elements by element name. For example, use the p selector to select all paragraph elements.

2. Class Selector: Select HTML elements by class name. Class names begin with a dot (.). For example, use the .class selector to select all elements with a specified class.

3. ID Selector: Selects HTML elements by their unique ID. The ID starts with a pound sign (#). For example, use the #id selector to select elements with a specified ID.

4. Attribute Selector: Select HTML elements through their attributes. There are many forms of attribute selectors. For example, the [attribute] selector can select all elements with a specified attribute, and the [attribute=value] selector can select elements with a specified attribute and value.

5. Descendant Selector: Select HTML elements through the descendant relationship of the element. Descendant selectors use spaces to separate different elements. For example, using the div p selector selects all paragraph elements within a div element.

6. Child Selector: Selects HTML elements through the direct child element relationship of the element. The child element selector uses the greater than sign (>) to separate different elements. For example, using the div > p selector selects all paragraph elements that are direct children of a div element.

7. Adjacent Sibling Selector: Selects HTML elements through their adjacent sibling relationship. Adjacent sibling selectors use a plus sign ( ) to separate different elements. For example, using the h1 p selector selects the first paragraph element immediately following the h1 element.

8. Universal Selector: Select all HTML elements. Universal selectors are represented by an asterisk (*). For example, use the * selector to select all HTML elements.

In addition to the common selector types mentioned above, CSS also provides more advanced selector types such as pseudo-class selector (Pseudo-class Selector) and pseudo-element selector (Pseudo-element Selector) for selection. An element in a specific state or position.

To summarize, CSS selectors are tools used to select HTML elements and apply styles. Understanding the different types of selectors can help developers select elements and apply styles more precisely, resulting in better web design and user experience.

The above is the detailed content of What css selectors are there?. For more information, please follow other related articles on the PHP Chinese website!