Common compound selectors include descendant selectors, child element selectors, adjacent sibling selectors, universal sibling selectors, attribute selectors, class selectors, ID selectors, pseudo-class selectors and pseudo- Element selectors etc. Detailed introduction: 1. Descendant selector, using a selector separated by spaces, means selecting the descendant elements of an element; 2. Child element selector, using a selector separated by a greater than sign, indicating selecting the direct child elements of an element; 3. Adjacent sibling selectors use selectors separated by plus signs to select the first sibling element immediately following an element, etc.

What are the common compound selectors?

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

The compound selector is a commonly used selector in CSS. It can select elements that meet the conditions through a combination of multiple selectors. In CSS, common compound selectors have the following types:

1. Descendant Selector: A selector separated by spaces to select the descendant elements of an element. For example, `div p` means to select all `

` elements that are descendants of `

` elements.

2. Child Selector: Use a selector separated by a greater than sign (>) to select the direct child elements of an element. For example, `div > p` means to select all `

` elements that are direct children of the `

` element.

3. Adjacent Sibling Selector: A selector separated by a plus sign ( ), indicating that the first sibling element immediately following an element is selected. For example, `h1 p` means selecting the first `

` element immediately following the `

` element.

4. General Sibling Selector: A selector separated by a tilde (~) to select all sibling elements after an element. For example, `h1 ~ p` means selecting all `
` elements after the `

` element.

5. Attribute Selector: Use square brackets ([]) to select elements with specified attributes. For example, `input[type="text"]` means to select all `` elements whose `type` attribute value is "text".

6. Class Selector: Use a selector starting with a period (.) to select elements with a specified class name. For example, `.red` means to select all elements with the class name "red".

7. ID Selector: Use the selector starting with the pound sign (#) to select the element with the specified ID. For example, `#header` means selecting the element with the ID "header".

8. Pseudo-class Selector: Use a selector starting with a colon (:) to select elements that meet a certain status or condition. For example, `:hover` indicates the selection state when the mouse is hovering over the element.

9. Pseudo-element Selector: Use a selector starting with a double colon (::) to select a specific part of the element. For example, `::before` indicates the content inserted before the selected element.

The above are the common compound selector types in CSS. By using these selectors flexibly, we can more accurately select and style elements in web pages to achieve rich and diverse effects. The combined use of compound selectors can further expand the scope and conditions of selection, making the selection ability of CSS more powerful and flexible.
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