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margin collapsing in css

Anonymous User 1990 14-Jun-2013
Hi Expert,

what is margin collapsing in CSS. Can you provide any example.

Thanks in advance.
css-css3 css-css3 
Updated on 15-Jun-2013
Anonymous User

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1 Answers

AVADHESH PATEL

AVADHESH PATEL

15-Jun-2013
In CSS, margin collapsing occurs when the top or bottom margin of one element comes into contact with the top or bottom margin of another element. The concept is simple: The smaller of the two margins is reduced to zero; if both element margins are the same length, then one of the margins is reduced to zero. 

#top
{
margin: 20px;
}
#bottom
{
margin: 10px; 
}
<div id="top"></div>
<div id="bottom"></div>

You can see the most common form of margin collapsing; the top margin of one element comes into contact with the bottom margin of another element. When this happens, the element with the bigger margin wins.

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