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table {
border-collapse: collapse;
}
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
* { margin:0; padding:0;}
.parent_div { width:80px; height:60px; border-width:0 1px 1px 0; border-style: solid; border-color:#0CC; }
.parent_div div { width:19px; height:19px; border-width:1px 0 0 1px; border-style: solid; border-color:#0CC; float:left; }
</style>
</head>
<body>
<div class="parent_div">
<div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div>
</div>
</body>