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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style type="text/css">
#d1,#d2 {
width: 400px;
height : 400px;
}
#d1 {
position : absolute;
top : 100px;
background : red;
z-index : 1;
}
#d2 {
position : absolute;
top : 150px;
background : blue;
z-index : 2;
}
</style>
</head>
<body>
<div id="d1">
<form>
<input type="text" name="username"/>
</form>
<p>中國</p>
<form>
<iframe style="z-index:1"><!-- 用iframe 解决此bug -->
<select name="country">
<option value="1">china</option>
<option value="2">japanese</option>
<option value="1">U.S.A</option>
</select>
</iframe>
</form>
</div>
<div id="d2">ddd</div>
</body>
</html>