The tbody element represents a block of rows that consist of a body of data for its parent table element.
A tbody element's start tag may be omitted if
the first thing inside the tbody element is a tr element, and if the element is not
immediately preceded by a tbody,
thead, or tfoot element whose end tag has been omitted.
A tbody element's end tag may be omitted if the
tbody element is immediately
followed by a tbody or
tfoot element, or if there
is no more content in the parent element.