<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
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<html>
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<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet">
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{
$('#image_preview').append("<div class='col-md-3'><img class='img-responsive' src='"+URL.createObjectURL(event.target.files[i])+"'></div>");
}
}
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<body>
<div class="container">
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<ul class="nav nav-tabs">
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</ul>
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