The src function for CSS specifies a pointer to a resource.
src()
<src()> = src( <string> <url-modifier>* )
<string>
Specifies a sequence of characters delimited by double quotes (") or single quotes (').
<url-modifier>
Changes the meaning or the interpretation of the URL.
url
abs
acos
asin
atan
atan2
attr
calc
clamp
color
conic-gradient
cos
counter
counters
hsl
hsla
hwb
lab
lch
linear-gradient
matrix
matrix3d
max
min
mod
oklab
oklch
param
perspective
radial-gradient
rem
repeating-conic-gradient
repeating-linear-gradient
repeating-radial-gradient
rgb
rgba
rotate
rotate3d
rotateX
rotateY
rotateZ
round
scale
scale3d
scaleX
scaleY
scaleZ
sin
skew
skewX
skewY
tan
translate
translate3d
translateX
translateY
translateZ
var
World Wide Web Consortium (W3C)