SECTION 10.8
935
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.
(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).
Summary
text string
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-