thead, tfoot and tbody order in HTML5

Question

I was reading in a forum about element that it must come after element. In contrast I saw some people use the order

Answer 1

In the HTML 5.1 spec, can only come after .

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.

https://www.w3.org/TR/html51/tabular-data.html#tabular-data