<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>BOM
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<style type="text/css">
body{margin:0;}
div{width: 100px;height: 100px;border:1px solid #000;}
div>div{width: 50px;height: 400px;background: #f00;}
</style>
<script>
window.onload=function (){
};
</script>
</head>
<body style="height:2000px;">
<div id="div1"><div></div></div>
</body>
</html>
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