When two adjacent normal elements set margin, their spacing is not simply the sum of the margins.
<!DOCTYPE HTML><HTMLLang= "en"><Head> <MetaCharSet= "UTF-8"> <title>Overlap of margin</title></Head><style>#div1{Height:100px;Margin-bottom:50px;background:Blue; }#div2{Height:100px;Margin-top:50px;background:Green; }</style><Body> <DivID= "Div1"></Div> <DivID= "Div2"></Div></Body></HTML>
The effect is as follows:
The height of the two Div is 100px, and the apparent spacing is not 50px+50px
The reason is that when the margin is set for two adjacent ordinary elements, the margin between the actual ones satisfies the side where the outer margin is larger. Certainly at the same time must satisfy to set the margin smaller side.
This overlap is not worth taking place between sibling elements, and parent-child elements overlap.
Overlap of margin
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