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<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>#</title>
<style>
.innerbox{
display:inline-block;
width:200px;
height:100px;
margin:5px;
background-color:chocolate;
}
</style>
</head>
<body>
<div id="box">
</div>
</body>
</html>
<script>
for (var i = 0; i < 30; i++) {
var _box = document.createElement('div');
_box.className = "innerbox";
document.getElementById('box').appendChild(_box);
}
</script>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>#</title>
<style>
.innerbox{
display:inline-block;
width:200px;
height:100px;
margin:5px;
background-color:chocolate;
}
</style>
</head>
<body>
<div>
<div class="innerbox"></div>
<div class="innerbox"></div>
<div class="innerbox"></div>
<div class="innerbox"></div>
<div class="innerbox"></div>
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<div class="innerbox"></div>
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<div class="innerbox"></div>
<div class="innerbox"></div>
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<div class="innerbox"></div>
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<div class="innerbox"></div>
<div class="innerbox"></div>
<div class="innerbox"></div>
</div>
</body>
</html>