Inline areas are areas that are parts of lines.
An inline area has a position point that lies on one
edge of its box and an orientation called the escapement direction,
which is perpendicular to the edge of the box on which
the position point lies.
The point on the box which lies in the escapement direction
from the position point and is on the opposite edge of the box
is called the escapement point of the inline area.
|Informally the box has an arrow pointing from the position point that
says place me so that the arrow lies parallel to the line I'm in.|Inline areas are positioned to form lines in the following manner.
The writing-mode for a paragraph gives an inline-progression
direction for the paragraph.
There is a placement point associated with the process
of constructing a line.
The first inline area is oriented so
that its escapement direction is the same as the inline-progression
direction of the paragraph, and the point on the inline area's box
opposite to the position point becomes the current placement point.
The next area is placed so that its position point is coincident with
the current placement point and oriented so that its escapement
direction is the same as the inline-progression direction of the
paragraph. The point on the inline area's box opposite to
the position point becomes the current placement point for placing the
This is illustrated in Figure 8, Inline Area Placement
and Positioning. There are additional steps in the process when the paragraph
uses more than one writing-mode. For example, in
Figure 12, Mixed Writing-Mode for Hebrew and English, there is an inline-progression direction
of left-to-right for the English text and an inline-progression direction
of right-to-left for the Hebrew text. In addition, line breaking
becomes more complex in this case. The alignment mode specified by the alignment
mode property for the
font resource also influences how glyphs are positioned, as illustrated
in Figure 13, Scripts with Mixed
There are characteristics on inlined flow objects
that can modify this process.
An inline area also has a line-progression direction, which is
perpendicular to the inline-progression direction for its paragraph.
Certain characteristics of inline areas are specified in terms
of the line-progression direction.