Detailed explanation of the difference between css properties border-collapse and border-spacing

* { margin:0; 
padding
:0;}
table { 
border-collapse:separate; border-spacing:20px;
 width:600px; 
line-height
:22px; 
font-size
:12px;}
tr,td { border:1px solid #999;}
td { padding:1px 2px;}
.one { 
font-weight
:bolder; color:red;}
.title { width:140px;}
.title2 { width:350px;}
.title3 { width:90px;}

<table>
   <tbody>
   <tr class="one">
      <td class="title">礼品名称</td>
      <td class="title2">兑换规则</td>
      <td class="title3">是否限量</td>
   </tr>
   <tr>
      <td>QQ秀装扮、QQ空间装扮</td>
      <td>活动期间每个QQ限量领取，QQ秀、QQ空间装扮有效期7天</td>
      <td>限量</td>
   </tr>
   <tr>
      <td>红钻一个月</td>
      <td rowspan="2">每天限领1个，活动期间最多兑换20次</td>
      <td>不限</td>
   </tr>
   <tr>
      <td>捕鱼假日、QQ炫舞、王朝霸域、战龙三国、寻侠、蜀山传、QQ部落等礼包</td>
      <td>限量</td>
   </tr>
   <tr>
      <td>红钻一个月</td>
      <td rowspan="3">每天限领1个，活动期间最多兑换10次</td>
      <td>不限</td>
   </tr>
   <tr>
      <td>QQ秀手机壳</td>
      <td>限量</td>
   </tr>
   <tr>
      <td>蛇年QQ</td>
      <td>限量</td>
   </tr>
   <tr>
      <td>Ipad</td>
      <td>活动期间限领取1次</td>
      <td>限量</td>
   </tr>
   </tbody>
</table>

* { margin:0; padding:0;}
table { 
border-collapse:collapse;
 width:600px; line-height:22px; font-size:12px;}
tr,td { border:1px solid #999;}
td { padding:1px 2px;}
.one { font-weight:bolder; color:red;}
.title { width:140px;}
.title2 { width:350px;}
.title3 { width:90px;}