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<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.box{
width: 200px;
height: 200px;
background-color: #3295F2;
}
</style>
</head>
<body>
<div class="box" id="box" tabindex="1"></div>
<script>
document.getElementById('box').onblur = function(){
alert('div blur');
};
</script>
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