<!DOCTYPE html>
2 <html>
3 <head lang="en">
4 <meta charset="UTF-8">
5 <title></title>
6 </head>
7
8 <style>
9 #a {color : #FFFF00;}
10
11 #a:hover + #c{color : #00FF00;}
12 #a:hover + #c > #b{color : #0000FF;}
13 </style>
14 <div id='a'>元素1
15
16 </div>
17 <div id='c'>元素3
18 <div id='b'>元素2</div>
19 </div>
20
21
22 </html>html
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