What are the combination selectors?

Combined selectors include descendant selectors, child element selectors, adjacent sibling selectors, universal sibling selectors, group selectors, intersection selectors, sub-selectors, pseudo-class selectors and pseudo-elements Selectors etc. Detailed introduction: 1. The descendant selector matches elements by selecting the descendant elements of the element. It uses spaces to indicate the relationship between elements; 2. The child element selector matches elements by selecting the direct child elements of the element. It uses "> The ";" symbol represents the relationship between elements; 3. The adjacent sibling selector matches elements by selecting the next sibling element of the element, etc.

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

In CSS, combining selectors is a method of selecting specific elements by combining multiple selectors. By combining selectors, we can more precisely select the elements that need to be styled. Below I will introduce some common combination selectors.

1. Descendant Selector:

The Descendant Selector matches elements by selecting their descendant elements. It uses spaces to indicate relationships between elements. For example, to select all e388a4556c0f65e1904146cc1a846bee elements located inside the dc6dce4a544fdca2df29d5ac0ea9906b element, you can use the following selector:

     div  p

2. Child Selector:

Child element Selectors match elements by selecting their immediate children. It uses the ">" symbol to indicate relationships between elements. For example, to select all e388a4556c0f65e1904146cc1a846bee elements directly inside a dc6dce4a544fdca2df29d5ac0ea9906b element, you can use the following selector:

     div  >  p

3. Adjacent Sibling Selector:

The adjacent sibling selector matches elements by selecting the next sibling element of the element. It uses " " notation to represent relationships between elements. For example, to select all e388a4556c0f65e1904146cc1a846bee elements located after the 4a249f0d628e2318394fd9b75b4636b1 element, you can use the following selector:

     h1  +  p

4. General Sibling Selector:

General The sibling selector matches an element by selecting all of its siblings. It uses the "~" symbol to indicate relationships between elements. For example, to select all e388a4556c0f65e1904146cc1a846bee elements located after the 4a249f0d628e2318394fd9b75b4636b1 element, you can use the following selector:

     h1  ~  p

5. Group Selector:

Group Selectors combine multiple selectors with commas to select all elements that match any one of the selectors. For example, to select all 4a249f0d628e2318394fd9b75b4636b1 elements and e388a4556c0f65e1904146cc1a846bee elements, you can use the following selector:

     h1,  p

6. Intersection Selector:

The intersection selector passes both Match multiple selectors to match elements. It uses spaces to group multiple selectors together. For example, to select all elements with both class "red" and "bold", you can use the following selector:

     .red.bold

7. Child Selector:

Child Selector Match elements by selecting their child elements. It uses the ">" symbol to indicate relationships between elements. For example, to select all direct child elements e388a4556c0f65e1904146cc1a846bee located inside the dc6dce4a544fdca2df29d5ac0ea9906b element, you can use the following selector:

     div  >  p

8. Pseudo-class Selector:

Pseudo-class selectors are used to select a specific state or position of an element. They start with a colon ":" and are appended to the end of the selector. For example, to select all 3499910bf9dac5ae3c52d5ede7383485 elements in the hover state, you can use the following selector:

     a:hover

9. Pseudo-element Selector:

Pseudo-element Selector The selector is used to select a specific part of an element or generated content. They start with a double colon "::" and are appended to the end of the selector. For example, to select the first word of each paragraph, you can use the following selector:

     p::first-letter

These are some common combination selectors, which can help us select the elements that need to be styled more accurately. By flexibly using these combined selectors, we can better control and customize the style of the page. I hope this introduction to combined selectors can help you better understand and use CSS.

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