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This article mainly shows you "what are the CSS selector types", the content is simple and clear, and I hope it can help you solve your doubts. Let the editor lead you to study and learn what CSS selector types are.

Summary of CSS selector types

1. Universal selector

It is generally used to make some general style settings for all elements, such as clearing the inner and outer margins, and so on. But the efficiency is relatively low, try not to use it.

* {

Margin: 0

Padding: 0

}

two。 Element selector

Also known as the tag selector, it is used to select a class of tags for styling.

Div {color: # ff0000;}

Span {font-size: 18px;}

3. Class selector

Add a class attribute to the element and select the element with the .class attribute value.

An element can have multiple class values, with each class value separated by a space

If the class value consists of multiple words, the words can be marked with an underscore -, an underscore _, or a hump.

It is best not to use the label signature as the class value

.box {

Width: 100px

Height: 100px

Background-color: # ff0000

}

4.id selector

Add an id attribute to the element and select the element with the value of the # id attribute.

The id value in an HTML document is unique and cannot be repeated.

If the id value consists of multiple words, the words can be marked with an underscore -, an underscore _, or a hump.

It is best not to use the label signature as the value of id

# container {color: # ff0000;}

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