(Auszug aus "XSL-FO ― Die Referenz" von Manuel Montero Pineda & Steffen Herkert, 2016, dpunkt.verlag)
Category Ruby Extended Properties
Specifies the font condense when the ruby text is longer than its base.
|Value:||none | <percentage> | <number>|
|Percentages:||refer to the ruby-font-size|
Condenses ruby by "stretch" so that length of ruby becomes the same as its base characters when ruby is longer than its base characters. The numerical value shows the limit to be shorten at that time. If none is specified, ruby is not condensed.