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In CSS, functions can be used in values to invoke special processing or visual effects.
CSS cross-fade() function
CSS images: url()
blur()
brightness()
calc
contrast()
cubic-bezier
custom()
drop-shadow()
grayscale()
hue-rotate()
invert()
linear-gradient
matrix()
matrix3d
opacity()
perspective
repeating-linear-gradient
repeating-radial-gradient
rotate()
rotate3d()
rotateX()
rotateY()
rotateZ()
saturate()
scale()
scale3d()
scaleX()
scaleY()
scaleZ()
sepia()
skew()
skewX()
skewY()
steps
translate()
translate3d()
translateX()
translateY()
translateZ()
var