What are the computer composite selectors?

Computer compound selectors mainly include "descendant selector", "child selector", "union selector" and "pseudo-class selector": 1. Descendant selector, which can select parent elements sub-elements inside; 2. Sub-selector, which can only select the most recent sub-element of an element; 3. Union selector, which can select multiple groups of tags and define the same style for them at the same time; 4. Pseudo-class selection selector, used to add special effects to certain selectors.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Compound selectors in computers mainly include the following types:

1. Descendant selectors:

   Also known as inclusion selectors, you can select the parent child elements within the element. The way to write it is to write the outer label at the front and the inner label at the back, separated by spaces in between. When tags are nested, the inner tag becomes a descendant of the outer tag.

2. Subselector:

   Only the most recent child element of an element can be selected. The simple understanding is to choose the son element.

3. Union selector:

   You can select multiple groups of tags and define the same style for them at the same time. Usually used for collective statements. The union selector is composed of selectors connected by English commas. Any form of selector can be used as part of the union selector.

4. Pseudo-class selector:

   is used to add special effects to certain selectors, such as adding special effects to links, or selecting the 1st or nth elements.

In addition, there are also label-specific selectors and so on. The above information is for reference only. It is recommended to consult professional books or professionals to obtain more comprehensive and accurate information.

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