CSSMathValue

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

The CSSMathValue interface of the CSS_Object_Model#css_typed_object_model 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 Experimental

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.

Event handlers

No

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
CSS Typed OM Level 1
# complex-numeric

Browser compatibility

BCD tables only load in the browser