1.相对定位bug：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style type="text/css">
.box1{width: 100px;height: 300px;background: red;overflow: hidden; }
.box2{width: 300px;height: 100px;background: blue;position: relative;top: 10px;}
/*for IE6:使定位父级的overflow属性生效。*/
.box1{position: relative;}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
</body>
</html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style type="text/css">
.box1{width: 301px;height: 301px;border: 1px solid red;position: relative;}
/*IE6 bug:当父级宽高为偶数,其绝对定位子级设置→→右下←←的偏移量后，出现1px的bug*/
.box2{width: 20px;height: 20px;background: green;position: absolute;right: 0;bottom: 0;}
/*for IE6：将父级的宽高尽量设置为偶数*/
.box1{width: 300px;height: 300px;}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
</body>
</html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style type="text/css">
/*已经给清浮动元素设置 →→绝对/固定←← 定位后，不需要清浮动*/
.box{border: 10px solid black;position: absolute;}
.type{width: 300px;height: 300px;background: red;float: left;}
</style>
</head>
<body>
<div class="box">
<div class="type"></div>
</div>
</body>
</html>
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