How we display text in modern word processors such as Microsoft Word depends on norms from the age of typewriters and even the dawn of the printing press.
When I (accidentally) used a non-standard glyph for the Greek letter kappa in my PhD thesis, the line spacing of 1.0 in Word became a fourth wider - at nominally identical font type and size. I then learned that the interline distance (in fact not 1 for 1.0) is calculated based on letter shapes to emulate historic typesetting.

#fonts #design