css block level formatting context BFC

This article mainly introduces the css block-level formatting context BFC, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

BFC rendering area

This area is created by an HTML element. The following elements will create a BFC area inside it

1. Root element

2. Floating and absolutely positioned elements

3. Overflow is not equal to the visible block box

The effect of creating a BFC is applied to its child elements. They are independent of different BFC areas, and they do not interfere with each other when rendering

Create the BFC element and isolate it The connection between internal and external, internal rendering will not affect the external

Specific rules:

1. Create a BFC element, its automatic height needs to be calculated for floating elements

2. When creating a BFC element, its border box will not overlap with floating elements. The value will also be automatically created. BFC

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