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                                                   935
          SECTION 10.8                                                        Accessibility Support




                                TABLE 10.36 Standard table attributes
KEY           TYPE          VALUE

RowSpan       integer       (Optional; not inheritable) The number of rows in the enclosing table that are
                            spanned by the cell. The cell expands by adding rows in the block-progression
                            direction specified by the table’s WritingMode attribute. Default value: 1.
                            This entry applies only to table cells that have structure types TH or TD or that
                            are role mapped to structure types TH or TD (see “Table Elements” on page 883).

ColSpan       integer       (Optional; not inheritable) The number of columns in the enclosing table that are
                            spanned by the cell. The cell expands by adding columns in the inline-progres-
                            sion direction specified by the table’s WritingMode attribute. Default value: 1.
                            This entry applies only to table cells that have structure types TH or TD or that
                            are role mapped to structure types TH or TD (see “Table Elements” on page 883).

Headers       array         (Optional; not inheritable; PDF 1.5) An array of byte strings, where each string is
                            the element identifier (see the ID entry in Table 10.10) for a TH structure element
                            that is a header associated with this cell.
                            This attribute may apply to header cells ( TH) as well as data cells (TD) (see “Table
                            Elements” on page 883). Therefore, the headers associated with any cell are those
                            in its Headers array plus those in the Headers array of any TH cells in that array,
                            and so on recursively.

Scope         name          (Optional; not inheritable; PDF 1.5) A name with one of the values Row, Column,
                            or Both. This attribute applies only to TH elements (see “Table Elements” on page
                            883) and indicates whether the header cell applies to the rest of the cells in the
                            row that contains it, the column that contains it, or both the row and the column
                            that contain it.

Summary       text string   (Optional; not inheritable; PDF 1.7) A summary of the table’s purpose and struc-
                            ture, for use in non-visual rendering such as speech or braille. This entry applies
                            only to Table structure elements (see “Table Elements” on page 903).


  10.8 Accessibility Support

          PDF includes several facilities in support of accessibility of documents to users
          with disabilities. In particular, many visually computer users with visual impair-
          ments use screen readers to read documents aloud. To enable proper vocaliza-

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