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CSSPrimitiveValue: getStringValue() method - Web APIs | MDN
Type Description
DOMExceptionAn INVALID_ACCESS_ERR is raised if the CSS value doesn't contain a string value.
const cs = window.getComputedStyle(document.body);
const cssValue = cs.getPropertyCSSValue("display");
console.log(cssValue.getStringValue());
This feature was originally defined in the DOM Style Level 2 specification, but has been dropped from any
standardization effort since then.
It has been superseded by a modern, but incompatible, CSS Typed Object Model API that is now on the standard track.
