请问我是在表格标题下面放的横线，为什么会显示在标题上面了
<body>
<h3>成绩汇总</h3>
<table border="1">
<caption>三年二班成绩汇总表</caption>
<hr>
<thead>
<tr>
<th>科目</th>
<th>分数</th>
</tr>
</thead>
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<body>
<h3>成绩汇总</h3>
<table border="1">
<caption>三年二班成绩汇总表</caption>
<hr>
<thead>
<tr>
<th>科目</th>
<th>分数</th>
</tr>
</thead>
2020-05-07
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