CSSMathValue

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

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

CSSStyleValue CSSNumericValue CSSMathValue

Interfaces based on CSSMathValue

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

Instance properties

CSSMathValue.operator

Indicates the operator that the current subtype represents.

Static methods

The interface may also inherit methods from its parent interface, CSSNumericValue.

Instance methods

The interface may also inherit methods from its parent interface, CSSNumericValue.

Examples

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

html
<div>has width</div>

We assign a width with a calculation

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

We add the JavaScript

js
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
CSS Typed OM Level 1
# complex-numeric

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
CSSMathValue
operator

Legend

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Full support
Full support
No support
No support
See implementation notes.