CSS

The CSS interface holds useful CSS-related methods. No objects with this interface are implemented: it contains only static methods and is therefore a utilitarian interface.

Properties

The CSS interface is a utility interface and no object of this type can be created: only static properties are defined on it.

Static properties

CSS.paintWorklet Secure context

Provides access to the Worklet responsible for all the classes related to painting.

Methods

The CSS interface is a utility interface and no object of this type can be created: only static methods are defined on it.

Static methods

No inherited static methods.

CSS.registerProperty()

Registers custom properties, allowing for property type checking, default values, and properties that do or do not inherit their value.

CSS.supports()

Returns a Boolean indicating if the pair property-value, or the condition, given in parameter is supported.

CSS.escape()

Can be used to escape a string mostly for use as part of a CSS selector.

CSS factory functions

Can be used to return a new CSSUnitValue with a value of the parameter number of the units of the name of the factory function method used.

CSS.em(3) // CSSUnitValue {value: 3, unit: "em"}

Specifications

Specification
CSS Conditional Rules Module Level 3 (CSS Conditional 3)
# the-css-interface

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
CSS
28
12
22
No
12.1
10
4.4
28
22
12.1
Yes
1.5
Hz
66
79
No
No
53
No
66
66
No
47
No
9.0
Q
66
79
No
No
53
No
66
66
No
47
No
9.0
ch
66
79
No
No
53
No
66
66
No
47
No
9.0
cm
66
79
No
No
53
No
66
66
No
47
No
9.0
deg
66
79
No
No
53
No
66
66
No
47
No
9.0
dpcm
66
79
No
No
53
No
66
66
No
47
No
9.0
dpi
66
79
No
No
53
No
66
66
No
47
No
9.0
dppx
66
79
No
No
53
No
66
66
No
47
No
9.0
em
66
79
No
No
53
No
66
66
No
47
No
9.0
escape
46
79
31
No
33
10
46
46
31
33
10
5.0
ex
66
79
No
No
53
No
66
66
No
47
No
9.0
fr
66
79
No
No
53
No
66
66
No
47
No
9.0
grad
66
79
No
No
53
No
66
66
No
47
No
9.0
ic
No
No
No
No
No
No
No
No
No
No
No
No
in
66
79
No
No
53
No
66
66
No
47
No
9.0
kHz
66
79
No
No
53
No
66
66
No
47
No
9.0
lh
No
No
No
No
No
No
No
No
No
No
No
No
mm
66
79
No
No
53
No
66
66
No
47
No
9.0
ms
66
79
No
No
53
No
66
66
No
47
No
9.0
number
66
79
No
No
53
No
66
66
No
47
No
9.0
paintWorklet
65
79
No
No
52
No
65
65
No
47
No
9.0
pc
66
79
No
No
53
No
66
66
No
47
No
9.0
percent
66
79
No
No
53
No
66
66
No
47
No
9.0
pt
66
79
No
No
53
No
66
66
No
47
No
9.0
px
66
79
No
No
53
No
66
66
No
47
No
9.0
rad
66
79
No
No
53
No
66
66
No
47
No
9.0
registerProperty
78
79
No
No
65
No
78
78
No
No
No
12.0
rem
66
79
No
No
53
No
66
66
No
47
No
9.0
rlh
No
No
No
No
No
No
No
No
No
No
No
No
s
66
79
No
No
53
No
66
66
No
47
No
9.0
supports
61
28
Version 60 or older didn't support parentheses-less one-argument version.
12
Edge doesn't support parentheses-less one-argument version.
55
22
Version 54 or older didn't support parentheses-less one-argument version.
No
12.1
10
61
37
Version 60 or older didn't support parentheses-less one-argument version.
61
28
Version 60 or older didn't support parentheses-less one-argument version.
55
22
Version 54 or older didn't support parentheses-less one-argument version.
12.1
Yes
8.0
1.5
Samsung Internet 8.0 or older didn't support parentheses-less one-argument version.
turn
66
79
No
No
53
No
66
66
No
47
No
9.0
vb
No
No
No
No
No
No
No
No
No
No
No
No
vh
66
79
No
No
53
No
66
66
No
47
No
9.0
vi
No
No
No
No
No
No
No
No
No
No
No
No
vmax
66
79
No
No
53
No
66
66
No
47
No
9.0
vmin
66
79
No
No
53
No
66
66
No
47
No
9.0
vw
66
79
No
No
53
No
66
66
No
47
No
9.0

See also

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/CSS