<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.father_div {}
.child_div {
width: 50px;
height: 50px;
background-color: yellow;
display: none;
}
.father_div:hover .child_div {
display: block;
}
</style>
<style>
.second_div {
width: 50px;
height: 50px;
background-color: yellowgreen;
display: none;
}
.first_div:hover+.second_div {
display: block;
}
</style>
<style>
.second2_div {
width: 50px;
height: 50px;
background-color: yellowgreen;
display: none;
}
.first2_div:hover+div+div+.second2_div {
display: block;
}
</style>
</head>
<body>
<div class="father_div">子元素的显示隐藏
<div class="child_div"></div>
</div>
<p></p>
<div>
<div class="first_div">相邻的下一个兄弟元素的显示隐藏</div>
<div class="second_div"></div>
</div>
<p></p>
<div>
<div class="first2_div">不相邻的兄弟元素的显示隐藏(2)</div>
<div></div>
<div></div>
<div class="second2_div"></div>
</div>
</body>
</html>
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