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This article mainly explains "what is the CSS universal selector". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what the CSS universal selector is.

Id selector: # header {}

Class selector: .header {}

Element selector: div {}

Subselector: ul > li {}

Descendant selector: div p {}

Pseudo-class selector:: hover,: selection, .action,: first-child,: last-child,: first-of-type,: last-of-type,: nth-of-type (n),: nth-of-last-type (n), for example, a:hover {}

Pseudo element selector:: after,: before, etc., for example: li:after

Property selector: input [type= "text"]

Combinatorial selector: Emam Fram E F (descendant selector) / E > F (child element selector) / EquiF (directly adjacent element selector-adjacent sibling elements after matching) / EtalF (ordinary adjacent element selector-sibling elements after matching)

Hierarchical selector: p~ul selects each ul element preceded by a p element

What is the basic syntax of css? the basic syntax of css is:

1. The css rule consists of a selector and one or more declarations.

2. Selectors are usually HTML elements that need to be styled

3. Each declaration consists of an attribute and a value

4. Attributes and attribute values are separated by colons.

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