Default font size is set to 10px, then each unit is set to be larger than 10px, if the unit value passes then the text will be larger than the x that preceeds it.
x
initial
x
px
x
%
x
em
x
rem
x
vw
x
vh
x
vmin
x
vmax
x
ex
x
pt
x
pc
x
ch
x
cm
x
mm
x
in
x
Calc
x
Var