Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Note: This method was part of an attempt to create a typed CSS Object Model. This attempt has been abandoned, and most browsers do not implement it.
To achieve your purpose, you can use:
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");
BCD tables only load in the browser