JustificationProperties

These property values are used to apply justification to paragraph text.

These justification features can be seen in the dialog in the Paragraph panel's flyout menu item labeled "Justification...". They are expressed with an object literal with the following properties (values are percentages):

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{    
     // Minimum, Desired and Maximum percentage of normal word spacing
     wordSpacingMinimum:   number,
     wordSpacingDesired:   number,
     wordSpacingMaximum:   number,
     // Minimum, Desired and Maximum percentage of normal letter spacing
     letterSpacingMinimum: number,
     letterSpacingDesired: number,
     letterSpacingMaximum: number,
     // Minimum, Desired and Maximum percentage of normal glyph scaling
     glyphScalingMinimum:  number,
     glyphScalingDesired:  number,
     glyphScalingMaximum:  number
     // Percentage of type size to use for auto leading
     autoLeadingAmount:    number
}
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{    
     // Minimum, Desired and Maximum percentage of normal word spacing
     wordSpacingMinimum:   number,
     wordSpacingDesired:   number,
     wordSpacingMaximum:   number,
     // Minimum, Desired and Maximum percentage of normal letter spacing
     letterSpacingMinimum: number,
     letterSpacingDesired: number,
     letterSpacingMaximum: number,
     // Minimum, Desired and Maximum percentage of normal glyph scaling
     glyphScalingMinimum:  number,
     glyphScalingDesired:  number,
     glyphScalingMaximum:  number
     // Percentage of type size to use for auto leading
     autoLeadingAmount:    number
}

Unless it's been set, the justificationFeatures value is null. The setter allows you to set individual properties: the missing ones will be either filled with the default values or left untouched.