HTML5 - 2017 订购 和 元素的正确方法？

Question

各位! 我在许多文章和类(class)中看到 <tfoot>在表格元素中应放在 <tbody> 之前元素。对...但是，当我这样做时，验证器 ( https://validator.w3.org ) 告诉我这是错误的，我不能使用 <tfoot>在这种情况下。所以我决定把 <tfoot>在<tbody>之后并且验证器没有在我的代码中发现任何错误。 那么...无论如何，正确的方法是什么？ 我还发现该规范似乎与其自身相矛盾:https://www.w3.org/TR/html51/tabular-data.html#the-tfoot-element

Answer 1

<tfoot>规范规则 were changed in December 2015 to disallow <tfoot> before <tbody> due to the accessibility issues it was causing .

就W3C规范而言，寻找相关要求的地方实际上是在the part of the spec that states the rules for what is allowed in the <table> element中。 ，它说:

In this order: optionally a caption element, followed by zero or more colgroup elements, followed optionally by a thead element, followed by either zero or more tbody elements or one or more tr elements, followed optionally by a tfoot element, optionally intermixed with one or more script-supporting elements.

注意它说 tfoot在 tbody 之后允许但在tbody之前不再说允许.