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长度值与单位 Length Data Types and Units
<length>
em
ex
ch
rem
vw
vh
vmax
vmin
cm
mm
q
in
pt
pc
px
角度值与单位 Angle Data Types and Units
<angle>
deg
grad
rad
turn
时间值与单位 Time Data Types and Units
<time>
s
ms
频率值与单位 Frequency Data Types and Units
<frequency>
Hz
kHz
特殊布局值与单位 Layout-specific Data Types and Units
<fraction>
<grid>
fr
gr
分辨率值与单位 Resolution Data Types and Units
<resolution>
dpi
dpcm
dppx
颜色值 Color Data Types
<color>
Color Name
HEX
RGB
RGBA
HSL
HSLA
transparent
currentColor
文本值 Textual Data Types
inherit
initial
unset
<string>
<url>
<identifier>
函数值 Functional Notations Data Types
calc()
toggle()
生成内容值 Content Notations Data Types
counter()
counters()
attr()
图像值 Image Data Types
<image>
image()
image-set()
<gradient>
linear-gradient()
radial-gradient()
repeating-linear-gradient()
repeating-radial-gradient()
数字值 Numeric Data Types
<number>
<integer>
<percentage>