[docs] hhea.Descender should be negative for descent below the baseline #1738
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Description
Refer to: https://glyphsapp.com/learn/vertical-metrics
hhea:
hheaAscender: the height of the ascenders in units
hheaDescender: the depth of the descenders in units (negative value) # <----- This
hheaLineGap: the recommended whitespace between lines
Checklist: