https://developer.mozilla.org/en-US/docs/Web/API/StylePropertyMap/set
StylePropertyMap: set() method - Web APIs | MDN
The set() method of the StylePropertyMap interface changes the CSS declaration with the given property.
web apisstylepropertymapsetmethodmdn
https://developer.mozilla.org/en-US/docs/Web/API/StylePropertyMap/clear
StylePropertyMap: clear() method - Web APIs | MDN
The clear() method of the StylePropertyMap interface removes all declarations in the StylePropertyMap.
clear methodweb apisstylepropertymapmdn
https://developer.mozilla.org/en-US/docs/Web/API/StylePropertyMap/append
StylePropertyMap: append() method - Web APIs | MDN
The append() method of the StylePropertyMap interface adds the passed CSS value to the StylePropertyMap with the given property.
web apisstylepropertymapappendmethodmdn