css3 条纹化和透明化表格Firefox下测试成功

<table>
<thead>
<tr>
<th>Synonym</th>
<th>Cosine</th>
</tr>
</thead>
<tbody>
{% for w in words %}
<tr>
<td>{{ w.0}}</td><td>{{ w.1}}</td>
</tr>
{% endfor %}
</tbody>
</table>

table{
font-family:"Trebuchet MS", Arial, Helvetica, sans-serif;
width:70%;
border-collapse:collapse;
position:relative;
left:50px;
}
thead th{
font-size:1.2em;
text-align:left;
padding-:5px;
padding-bottom:4px;
background-color:#663366;
color:#ffffff;
border:1px solid #990099;
padding:3px 7px 2px 7px;
}
tbody tr,td{
font-size:1em;
border:1px solid #990099;
padding:3px 7px 2px 7px;
}
tbody tr:nth-of-type(even){
background-color:rgba(138,43,226,0.2);
}
tbody tr:nth-of-type(odd){
background-color:rgba(169,169,169,0.2);
}