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The CSSMathValue interface of the CSS Typed Object Model API a base class for classes representing complex numeric values.
Below is a list of interfaces based on the CSSMathValue interface.
Instance propertiesCSSMathValue.operator
Indicates the operator that the current subtype represents.
The interface may also inherit methods from its parent interface, CSSNumericValue.
The interface may also inherit methods from its parent interface, CSSNumericValue.
We create an element with a width determined using a calc() function, then console.log() the operator.
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.
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