CSSMathValue: operator property

Limited availability

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

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

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
operator

Legend

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