为何提取的HTML代码生成的表格没有表格线？
<html>
<div class="co co1b1 coa2" >
<div class="h2 cf">
<span>OWNERSHIP INFORMATION</span>
</div>
<div class="br br1 brl" >
<table class=" mnytbl" summary="">
<caption class="hide"></caption>
<tbody>
<tr class=" first">
<td class="first" headers="">
<span >
Shares Outstanding
</span>
</td>
<td class="last" headers="">
<span >
1.55 Bil
</span>
</td>
</tr>
<tr >
<td class="first" headers="">
<span >
Institutional Ownership (%)
</span>
</td>
<td class="last" headers="">
<span >
71.86
</span>
</td>
</tr>
<tr >
<td class="first" headers="">
<span >
Top 10 Institutions (%)
</span>
</td>
<td class="last" headers="">
<span >
21.44
</span>
</td>
</tr>
<tr >
<td class="first" headers="">
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