Note: This feature is available in Web Workers.
The value read-only property of the CSSMathClamp interface returns a CSSNumericValue instance representing its preferred value.
The following code creates a CSSMathClamp object, then reads its value.
const clamp = new CSSMathClamp(CSS.px(10), CSS.percent(50), CSS.px(500));
console.log(clamp.value); // CSSUnitValue {value: 50, unit: "percent"}
console.log(clamp.value.value); // 50
console.log(clamp.value.unit); // "percent"value simply returns whatever CSSNumericValue was passed into the constructor — here that's a CSSUnitValue, since CSS.percent(50) is a CSSUnitValue. Passing a more complex expression, such as CSS.percent(50).add(CSS.em(2)) (a CSSMathSum), means value would return that CSSMathSum instead.