在html中的一个单元格加入iframe格式无法正常显示 - 黑马程序员技术交流社区

<html>
<head>
<title>我的第一个网页</title>
</head>
<body>
<table border="1px" width="100%" height="600px" cellspacing="0px">
<tr height="20%">
<td colspan="3" align="center" height="100px"><img src="1.png" width="100px" height="100px" usemap="#map_1" alt="error"/> </td>
</tr>
<map name="map_1">
<area shape="rect" coords="7,8,91,91" href="day1_1.htm" target="_blank" alt="error"/>
</map>
<tr>
<td width="100%">
<table border="1px" width="100%" height="100%" cellspacing="0px">
<tr height="30%">
<td rowspan="2" width="20%">
<ul>
<li><a href="#" target="m_iframe"> 列表一</a></li>
<li><a href="#" target="m_iframe"> 列表二</a></li>
</ul>
<ol type="A">
<li>第一列</li>
<li>第二列</li>
</ol>
<dl>
<dt>第一行</dt>
<dd>第二行</dd>
</dl>
<br />
<hr />
</td>
<td align="center"> <a href="day1_5.htm" target="m_iframe">网页连接</a></td>
<td rowspan="2" width="20%">
<iframe width="50px" height="100px" name="m_iframe" src="day1_5.htm" />
</td>
</tr>
<tr>
<td>
<form>
<table border="1px" width="50%" align="center" height="100%">
<tr >
<td >姓名</td><td><input type="text"/></td>
</tr>
<tr>
<td>密码</td><td><input type="password"/></td>
</tr>
<tr>
<td>性别</td>
<td>
男<input type="radio" name="sex_1" value="man">
女<input type="radio" name="sex_1" value="women"/>
</td>
</tr>
<tr>
<td>爱好</td><td>篮球<input type="checkbox" name="like" value="basketball"/>
  球<input type="checkbox" value="ball" name="like"/></td>
</tr>
<tr>
<td>地址</td>
<td>
<select>
<optgroup label="四川">
<option>成都</option>
<option >德阳</option>
</optgroup>
<option >绵阳</option>
</select>
</td>
</tr>
<tr>
<td>图片</td><td><input type="file"/></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="submitbutton"></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
</td>
</tr>
<tr height="20%">
<td align="center" width="100%"> <a href="#">尾</a></td>
</tr>
</table>
</body>
</html>

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