SECTION 10.7
919
Tagged PDF
KEY
TYPE
VALUE
WritingMode
name
(Optional; inheritable)
The directions of layout progression for packing of
ILSEs (inline progression) and stacking of BLSEs (block progression):
LrTb
Inline progression from left to right; block progression from
top to bottom. This is the typical writing mode for Western
writing systems.
Inline progression from right to left; block progression from
top to bottom. This is the typical writing mode for Arabic
and Hebrew writing systems.
Inline progression from top to bottom; block progression
from right to left. This is the typical writing mode for
Chinese and Japanese writing systems.
RlTb
TbRl
The specified layout directions apply to the given structure element and all of
its descendants to any level of nesting. Default value:
LrTb
.
For elements that produce multiple columns, the writing mode defines the
direction of column progression within the reference area: the inline direc-
tion determines the stacking direction for columns and the default flow order
of text from column to column. For tables, the writing mode controls the lay-
out of rows and columns: table rows (structure type
TR
) are stacked in the
block direction, cells within a row (structure type
TD
) in the inline direction.
Note:
The inline-progression direction specified by the writing mode is subject
to local override within the text being laid out, as described in Unicode Stan-
dard Annex #9,
The Bidirectional Algorithm,
available from the Unicode Con-
sortium (see the Bibliography).
BackgroundColor
array
(Optional; not inheritable; PDF 1.5)
The color to be used to fill the back-
ground of a table cell or any element’s content rectangle (possibly adjusted by
the
Padding
attribute). The value is an array of three numbers in the range
0.0 to 1.0, representing the red, green, and blue values, respectively, of an
RGB color space. If this attribute is not specified, the element is treated as if it
were transparent.