prince-forced-breaks: short | full
This property controls whether a line ended by a “preserved newline” (such as introduced by <br>) should preferably appear to be a normal full line (as if ended only by normal line wrapping), or whether being shorter than a normal full line is actually preferable, for example to mark a deliberate break.
The difference is particularly marked in justified text, where lines ended by prince-forced-breaks:full are subject to justification like most other lines.
(Limitation: At the time of writing, this property only affects justified text.)
This property only applies to Prince for Books.