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CSSMathValue: operator property

The CSSMathValue.operator read-only property of the CSSMathValue interface indicates the operator that the current subtype represents. For example, if the current CSSMathValue subtype is CSSMathSum, this property will return the string "sum".

Value

A String.

Interface Value
CSSMathSum "sum"
CSSMathProduct "product"
CSSMathMin "min"
CSSMathMax "max"
CSSMathClamp "clamp"
CSSMathNegate "negate"
CSSMathInvert "invert"

Examples

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

html

<div>My width has a <code>calc()</code> function</div>

We assign a width with a calculation

css

div {
  width: calc(50% - 0.5vw);
}

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").values); // CSSNumericArray {0: CSSUnitValue, 1: CSSMathNegate, length: 2}
console.log(styleMap.get("width").operator); // 'sum'
console.log(styleMap.get("width").values[1].operator); // 'negate'

The CSSMathValue.operator returns sum for the equation and negate for the operator on the second value.

Specifications

Specification
CSS Typed OM Level 1
# dom-cssmathvalue-operator

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
operator 66 79 No No 53 16.4 66 66 No 47 16.4 9.0

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https://developer.mozilla.org/en-US/docs/Web/API/CSSMathValue/operator