Web/API/CSSMathValue

Draft This page is not complete.

This is an experimental technologyCheck 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.

• CSSMathInvert
• CSSMathMax
• CSSMathMin
• CSSMathNegate
• CSSMathProduct
• CSSMathSum

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 1The definition of 'CSSMathValue' in that specification.	Working Draft	Initial definition.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
CSSMathValue Experimental'	Chrome Full support 66	Edge Full support 79	Firefox No support No	IE No support No	Opera Full support 53	Safari No support No	WebView Android Full support 66	Chrome Android Full support 66	Firefox Android No support No	Opera Android Full support 47	Safari iOS No support No	Samsung Internet Android Full support 9.0
operator Experimental'	Chrome Full support 66	Edge Full support 79	Firefox No support No	IE No support No	Opera Full support 53	Safari No support No	WebView Android Full support 66	Chrome Android Full support 66	Firefox Android No support No	Opera Android Full support 47	Safari iOS No support No	Samsung Internet Android Full support 9.0

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.

CSSMathValue by Mozilla Contributors is licensed under CC-BY-SA 2.5.