CSSMathValue

Draft
This page is not complete.

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

The CSSMathValue interface of the CSS Typed Object Model API a base class for classes representing complex numeric values.

Interfaces based on CSSMathValue

Below is a list of interfaces based on the CSSMathValue interface.

Properties

CSSMathValue.operator
Indicates the operator that the current subtype represents.

Event handlers

No

Methods

None.

Examples

We create an element with a width determined using a calc() function, then console.log() the operator.

<div>has width</div>

We assign a width with a calculation

div {
  width: calc(30% - 20px);
}

We add the JavaScript

const styleMap = document.querySelector('div').computedStyleMap();

console.log( styleMap.get('width') );                  // CSSMathSum {values: CSSNumericArray, operator: "sum"}
console.log( styleMap.get('width').operator );         // 'sum'
console.log( styleMap.get('width').values[1].value );  // -20

The CSSMathValue.operator returns 'sum' because styleMap.get('width').values[1].value ); is -20: adding a negative number.

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
CSSMathValue
Experimental
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 Yes
operator
Experimental
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 Yes

Legend

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

Document Tags and Contributors

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