Detailed explanation of padding and abbreviations within the CSS box model

Detailed explanation of padding and abbreviations within the CSS box model

As shown above, padding values ​​are composite attributes in clockwise order (upper right, lower right), where padding's inner margins affect the actual width and height of the box size.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.wrap{width: 200px;height: 200px;
background-color:red;/* padding: 10px; *//* padding: 10px 20px; *//* padding: 10px 20px 30px; */padding: 10px 20px 30px 40px;}
</style>
</head>
<body>
<div class="wrap"></div>
</body>
</html>

As shown in the code above, how can we ensure that the actual width and height of the box remain unchanged? We need to subtract the added padding value from it!

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