It is always centered horizontally in relation to the table width. The alignment of cell contents can be specified on a cell by cell basis, or inherited from enclosing elements, such as the row, column or the table element itself. The default is center. When rendering cells, horizontal alignment is determined by columns in preference to rows, while for vertical alignment, the rows are more important than the columns. The default is no border.
All units are in absolute pixels.
HTML 3.2 does not include this new feature. Nested tables inherit background table colors. The TR element is a container for a table row. The number of rows in a table is defined by the number of TR tags. The TD tag is a container for a table data cell.