<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
/*.father{
width: 300px;
height: 300px;
background: red;
&:hover{
width: 100px;
height: 100px;
background: yellow;
}
.son{
width: 200px;
height: 200px;
background: blue;
}
}*/
.father {
width: 300px;
height: 300px;
background: red;
}
.father:hover {
width: 100px;
height: 100px;
background: yellow;
}
.father .son {
width: 200px;
height: 200px;
background: blue;
}
</style>
</head>
<body>
<div class="father">
<div class="son"></div>
</div>
</body>
</html>
//后代是选择器那里有空格的
