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如果 atable不包含 a thead,是否tbody仍应包含?
table
thead
tbody
从浏览器的角度来看,总是存在一个tbody,即使你不插入它。是可选的tbody,除非您有theadortfoot标记。
tfoot
不,它不是必需的,您可以将<table>and<tr> <td>用于行和列。
<table>
<tr> <td>