JSFiddle - React, Tailwind, and code Playground

JavaScript

function applycss(property,value){
    var div = $("<div>");
    var _old = div.css(property);
    div.css(property,value);
    var _new = div.css(property);
    var valid = _old!=_new;
    console[valid?"log":"warn"]( `${property}:${value} is ${valid?"":"not"} valid!` );
}
console.clear();

applycss("color","blue");
applycss("color","#fff");
applycss("color","rgba(255,255,255)");//missing alpha channel, so this should be false
applycss("color","hsl(240,100%,50%)");