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C:\Program%20Files\Adobe\InDesign%202.0\Help\1_4_6_7.html
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Highlighting loose or tight lines
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Because composing a line of type involves many factors in addition to word spacing and letterspacing (hyphenation preferences, for example), InDesign cannot always honor your settings for word spacing and letterspacing. However, compositional problems in lines of text can be highlighted in yellow; the darkest of three shades indicates the most serious problems.
To highlight lines that are too tight or too loose:
Choose Edit > Preferences > Composition (Windows and Mac OS 9), or InDesign > Preferences > Composition (Mac OS 10).
Select H&J Violations and click OK.