Distances (Length Units)

Absolute Length Units (metric)

centimeters (10cm)

millimeters (300mm)

quarter millimeters (400Q)

Absolute Length Units (CSS inches based)

inches (3in)

points (216pt)

picas (18pc)

pixels (288px)

Relative Length Units (font-size: 12px)

em (and no font-size on element) (0.25em border)

em (0.25em border)

ex (0.25ex border)

ch (0.25ch border)

ic (0.25ic border)

cap (0.25cap border)

lh (0.25lh border)