Does flex belong to bootstrap?

Flex layout belongs to bootstrap; flex refers to elastic layout. Bootstrap can control the layout of the page through the flex class. Use ".d-flex" and ".d-inline-flex" to enable the flex layout style , whether you can use flex elastic layout is also the biggest difference between bootstrap3 and bootstrap4.

The operating environment of this tutorial: Windows 10 system, bootstrap version 5, DELL G3 computer

flex belongs to bootstrap

Bootstrap4 controls the layout of the page through the flex class

The biggest difference between Bootstrap 3 and Bootstrap 4 is that Bootstrap 4 uses flexible boxes for layout instead of floats.

• Use .d-flex and .d-inline-flex to enable flex layout style;

• .flex-row can render child elements The position in the horizontal direction, the default is left and displayed from left to right (1,2,3);

• .flex-row-reverse sub-element is positioned horizontally on the right and displayed from left to right (3, 2, 1);

• .flex-column realizes the vertical effect of child elements and displays (1, 2, 3) from top to bottom;

• .flex-column-reverse realizes the vertical effect of child elements and displays (3, 2, 1) from top to bottom;

• .justify-content-start (end, center, between, around) realizes content alignment;

• .align-items-start (end, center, baseline, stretch) realizes item alignment;

• .align-self-start(end, center, baseline, stretch) achieves single-item alignment;

The example is as follows:

            

                1            
            

                2            
            

                3            
        
        

            

                1            
            

                2            
            

                3            
        
        

            

                1            
            

                2            
            

                3            
        

The example is as follows :

  
  
  
  
  
  
  



  
Flex
  
使用 d-flex 类创建一个弹性盒子容器，并设置三个弹性子元素：
  
  
    
Flex item 1
    
Flex item 2
    
Flex item 3
  

Output result:

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