What is the CSS universal selector?

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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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