| Subject: | Remove units on '0' values |
When a value of a CSS property is 0, the unit is unnecessary and should
be removed by the minifier. The CSS3 specification states:
"The format of a length value (denoted by <length>) is a <number>
immediately followed by a unit identifier (e.g., 'px', 'gd'). After the
'0' length, the unit identifier is optional."
Values to be pruned if preceded by 0 are:
%, em, ex, px, gd, rem, vw, vh, vm, ch, mm, cm, in, pt, pc
Possibly also, but I am not sure:
deg, grad, rad, ms, s, Hz, kHz
See http://www.w3.org/TR/CSS2/syndata.html#numbers and http://www.w3.org/
TR/css3-values/#numbers0