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As its name suggests, the Tables Module provides table-related elements that are updated to enable access by non-visual user agents. When this module is used, it adds the table element to the Block content set of the Text Module. The following text was included in HTML 4 - should we make this a "MUST" in XHTML 2 for visual user agents? This attribute, which must be an integer > 0, and the default value for this attribute is 1.
User agents must ignore this attribute if the colgroup element contains one or more col elements. The col element allows authors to share attributes among several columns without implying any structural grouping. The element's span attribute (default value 1) specifies the number of columns in the group. The advantage of using the colgroup attribute is that authors may group information about multiple columns.
The col element allows authors to group together attribute specifications for table columns.
This attribute provides a summary of the table's purpose and structure for user agents rendering to non-visual media such as speech and Braille. The table element contains all other elements that specify caption, rows, content, and formatting for a table.
When a user agent allots extra cells to a row, extra row cells are added to the right of the table for left-to-right tables and to the left side for right-to-left tables. The direction of text in individual cells can be changed by setting the dir attribute in an element that defines the cell. This section provides more detailed discussion on cell header data and how non-visual agents may utilize that information. For a given data cell, the headers attribute lists which cells provide pertinent header information.

For a given header cell, the scope attribute tells the user agent the data cells for which this header provides information. In the following example, we assign header information to cells by setting the headers attribute. Users browsing a table with a speech-based user agent may wish to hear an explanation of a cell's contents in addition to the contents themselves. Users may also want information about more than one cell, in which case header information provided at the cell level (by headers, scope, and abbr) may not provide adequate context.
To accommodate this type of query, the table model allows authors to place cell headers and data into categories. Any cell containing information related to "San Jose" should refer to this header cell via either the headers or the scope attribute. Note that marking up the table this way also allows user agents to avoid confusing the user with unwanted information. This example illustrates how colgroup can be used to group columns and set the default column alignment. This attribute should be used to provide an abbreviated form of the cell's content, and may be rendered by user agents when appropriate in place of the cell's content.
This attribute may be used to place a cell into conceptual categories that can be considered to form axes in an n-dimensional space. This attribute specifies the list of header cells that provide header information for the current data cell. This attribute specifies the set of data cells for which the current header cell provides header information. For example, the following table contains four columns of data, each headed by a column description. In this table definition, we specify that the cell in row four, column two should span a total of three columns, including the current column. The next example illustrates (with the help of table borders) how cell definitions that span more than one row or column affect the definition of later cells.

As cell "2" spans the first and second rows, the definition of the second row will take it into account. If the thead, tfoot, and tbody elements are used, and a rowspan attriubte is used within a group, the rowspan must remain within the group boundaries of which it is defined.
This specifies the number of columns in a colgroup, or specifies the number of columns "spanned" by the col element. The "span" of the col element is the number of columns that will share the element's attributes.
You should use the td element for such cells together with the id or scope attributes as appropriate. Authors may choose to use this attribute instead of headers according to which is more convenient; the two attributes fulfill the same function.
Authors may thus categorize a given cell in any number of ways (or, along any number of "headers", hence the name). In the travel expense table, for example, we could add the additional categories "subtotals" and "totals". For instance, speech synthesizers may render the abbreviated headers relating to a particular cell before rendering that cell's content. This attribute may be used in place of the headers attribute, particularly for simple tables. Please consult the section on labeling cells for non-visual user agents for information and examples. The headers attribute is generally needed when headers are placed in irregular positions with respect to the data they apply to.

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