The cap unit for CSS specifies the length of the element relative to the cap-height of the element.
The cap-height is the height of a captial letter.
<number>cap
ch
em
ex
ic
rem
cm
cqb
cqh
cqi
cqmax
cqmin
cqw
deg
dpcm
dpi
dppx
dvb
dvh
dvi
dvmax
dvmin
dvw
grad
in
lvb
lvh
lvi
lvmax
lvmin
lvw
mm
ms
pc
pt
px
Q
rad
s
svb
svh
svi
svmax
svmin
svw
turn
vb
vh
vi
vmax
vmin
vw
World Wide Web Consortium (W3C)
