The <thead> HTML/xHTML tag
The thead tag may be included within any table tag, and it must come directly after the opening <table> tag. It encloses the first row of a table, and contains <th> column header cells, which define the data in the <td> table data cells below.
When to use the <thead> tag (semantic use)
You should use <thead> when your table requires column headers to define the type of data in that column. For example you might have a column containing a list of products, and a column containing a list of prices, so you would use a <thead> tag around the first row, with column headers Product and Price.
It’s valid in all current versions of HTML and xHTML, and it should always have a closing </thead> tag.
Example of <thead> tag use
The <thead> section comes after the <caption> and before the first <tbody>.
It is possible to have several <thead> sections inserted in the table, which may be useful in long tables.
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