The start-tag is required for this element. The end-tag is optional, if your SGML declaration allows minimization.
Header rows are always rendered at the beginning of the table.
This element is expected to obey the semantics of the CALS Table Model Document Type Definition, as specified by OASIS Technical Memorandum TM 9502:1995. Header rows are often presented in an alternate typographic style, such as boldface.
In paged media, if a table spans across multiple pages, header rows are printed at the top of each new page.
VAlign specifies the vertical alignment of text (and other elements) within the cells of this THead.
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