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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The CSSUnitValue() constructor creates a new CSSUnitValue object which returns a new CSSUnitValue object which represents values that contain a single unit type. For example, "42px" would be represented by a CSSNumericValue.


var CSSUnitValue = new CSSUnitValue()


Returns a double indicating the number of units.
Returns a USVString indicating the type of unit.


The following shows a method of creating a CSSPositionValue from individual CSSUnitValue constructors.

let pos = new CSSPositionValue(
    new CSSUnitValue(5, "px"),
    new CSSUnitValue(10, "px"));


Specification Status Comment
CSS Typed OM Level 1
The definition of 'CSSUnitValue' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
CSSUnitValue() constructor
Chrome Full support 66Edge No support NoFirefox No support NoIE No support NoOpera Full support 53Safari No support NoWebView Android Full support 66Chrome Android Full support 66Firefox Android No support NoOpera Android Full support 47Safari iOS No support NoSamsung Internet Android ?


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See Also

Document Tags and Contributors

Contributors to this page: estelle, jpmedley
Last updated by: estelle,