Note: This feature is available in Web Workers.
The keys() method of the CSSUnparsedValue interface returns a new array iterator that yields the index of each item in the object.
keys()None.
A new iterable iterator.
const value = new CSSUnparsedValue(["1em", "#445566", "-45px"]);
for (const index of value.keys()) {
console.log(index);
}
// 0
// 1
// 2