Designates rows as the table's header.
This element is a block element.
align, bgColor, className, document, id, isTextEdit, lang, language, offsetHeight, offsetLeft, offsetParent, offsetTop, offsetWidth, parentElement, parentTextEdit, sourceIndex, style, tagName, title, vAlign
click, contains, deleteRow, getAttribute, insertRow, removeAttribute, scrollIntoView, setAttribute
onclick, ondblclick, ondragstart, onfilterchange, onhelp, onkeydown, onkeypress, onkeyup, onmousedown, onmousemove, onmouseout, onmouseover, onmouseup, onselectstart