JSFiddle - React, Tailwind, and code Playground

HTML

<section id="test_div">
</section>
<section id="second_div">
</section>

CSS

#test_div {
	background: blue;
	color: #FFF;
	height: 100px;
	margin: 0 0 50px;
	width: 100%;
}
#test_div:hover {
	background: red;
}

JavaScript

$(document).ready(function() {
	function css(a) {
	    var sheets = document.styleSheets, o = {};
	    for (var i in sheets) {
	        var rules = sheets[i].rules || sheets[i].cssRules;
	        for (var r in rules) {
	            if (a.is(rules[r].selectorText)) {
	                o = $.extend(o, css2json(rules[r].style), css2json(a.attr('style')));
	            }
	        }
	    }
	    return o;
	}
	function css2json(css) {
	    var s = {};
	    if (!css) return s;
	    if (css instanceof CSSStyleDeclaration) {
	        for (var i in css) {
	            if ((css[i]).toLowerCase) {
	                s[(css[i]).toLowerCase()] = (css[css[i]]);
	            }
	        }
	    } else if (typeof css == "string") {
	        css = css.split("; ");
	        for (var i in css) {
	            var l = css[i].split(": ");
	            s[l[0].toLowerCase()] = (l[1]);
	        }
	    }
	    return s;
	}
	/*
	$("#test_div").click(function() {
		alert("clicked");
		if (!$(this).hasClass("hovered")) {
			alert("detected no hovered class");
			$(this).addClass("hovered");
			alert("added hovered class");
			var hoverStyle = css($("#test_div"));
			alert("created the hoverStyle variable");
			$("#second_div").css(hoverStyle);
			alert("applied the hoverStyle variable to #second_div");
		}
	});
	*/
	var hoverStyle = css($("#test_div"));
	// alert("created the hoverStyle variable");
	$("#second_div").css(hoverStyle);
	// alert("applied the hoverStyle variable to #second_div");
});