The pos() keyword is only used on an <lb/> element, and indicates the position of an element relative to the surrounding elements, It is used only for continued verse lines or list items, where part of an element which cannot fit on the original line is positioned above or below the original line, in the right margin and on the same line as the following element. In cases of this sort the continued part of the line is often marked by a bracket or other delimiter, to distinguish it from the line whose space it is invading. The pos() keyword should not be used for lines which simply wrap normally to a second line.
For example:
This is a bit of very bad verse;
The layout is bad and the rhymes are
Luckily no one famous wrote it [worse.
Otherwise I’d be afraid to quote it.
<l>This is a bit of very bad verse;</l>
<l>The layout is bad and the rhymes are <lb rend="pos(down) pre([)"/>worse.</l>
<l>Luckily no one famous wrote it </l>
<l>Otherwise I’d be afraid to quote it.</l>
However, if the poem were laid out as follows, there would be no need for the pos() keyword:
This is a bit of very bad verse;
The layout is bad and the rhymes are
worse.
Luckily no one famous wrote it
Otherwise I’d be afraid to quote it.