border-spacing属性允许你控制相邻单元格之间的距离。默认情况下，浏览器经常在每个单元格之间留有一个较小的空隙，如果你想增加或者减小这个空隙可以利用border-spacing属性来控制。
<!DOCTYPE html>
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<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style type="text/css">
td {
background-color: #0088dd;
padding: 15px;
border: 2px solid #000000;}
table.one {
border-spacing: 5px 15px;
}
table.two {
border-collapse: collapse;
}
</style>
</head>
<body>
<div>TODO write content</div>
<table class="one">
<tr>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td>3</td>
<td>4</td>
</tr>
<table class="two">
<tr>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td>3</td>
<td>4</td>
</tr>
</table>
</body>
</html>