There are several different ways you can declare the size of a font in CSS. The units fall into one of two categories - absolute and relative.
Absolute units are fixed. Once they are declared, their size cannot be altered by changing the font size of some other element. Those include px
, pt
and pc
units.
The size of relative units is determined by the size of a parent element. Their size can be altered by changing the sizing of that dependent element. Those include %
, em
, rem
, vw
, vh
, vmin
, vmax
, etc.
What units do you normally prefer to use?