eg
<style>
Html
{
BORDER:2PX solid blue;
}
Body
{
BORDER:2PX solid red;
margin:100px;
padding:50px;
}
</style>
<body>
This is the text section.
</body>
1. In the first case:
Body has margin,html not padding:
You can see that no matter how big the body of the margin, the body and the HTML side of the paste.
2.html has padding;
When the HTML has padding, it will affect the body size, so that the body shrinks.
The margin of the included module in HTML cannot change the size of the containing module, but it can affect the location of the included module in the containing module (HTML and body is an exception) and can change its size only if the containing module itself has padding.
eg
. One
{
BORDER:2PX solid blue;
}
. Two
{
BORDER:2PX solid red;
margin:50px;
}
<div class= "One" >
<div class= "Two" >
This is the text section.
</div>
</div>
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