Method: 1. Use the "parent element:nth-child(n)" selector. This selector will select the nth child element in the parent element, and there is no limit on the element type; 2. Use the "parent element:nth-child(n)" selector. Element:nth-of-type(n)" selector, this selector will also select the nth child element in the parent element, but only selects sibling elements.

The operating environment of this tutorial: Windows 10 system, CSS3&&HTML5 version, Dell G3 computer.

How to select the number of the css3 selector

1.:nth-child(n)

:nth-child(n) selector Matches the nth child element in the parent element. There is no restriction on the element type.

n can be a number, a keyword, or a formula.

The example is as follows:

      
  
This is a heading
 
The first paragraph.
 
The second paragraph.
 
The third paragraph.
 
注意: Internet Explorer 8 and以及更早版本的浏览器 :nth-child()选择器.
  

Output result:

##2, :nth-of-type(n )

      
  
This is a heading
 
The first paragraph.
 
The second paragraph.
 
The third paragraph.
 
The fourth paragraph.
  

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