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".
CSSMathValue: operator property
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