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".
A String.
| Interface | Value |
|---|---|
CSSMathSum | "sum" |
CSSMathProduct | "product" |
CSSMathMin | "min" |
CSSMathMax | "max" |
CSSMathClamp | "clamp" |
CSSMathNegate | "negate" |
CSSMathInvert | "invert" |
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.
| Specification |
|---|
| CSS Typed OM Level 1 # dom-cssmathvalue-operator |
| 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