Get exact value property (height example)

js

// if value in html
var height = $("element").get(0).style.height;

// if value in css
var rules = document.styleSheets[0].rules || document.styleSheets[0].cssRules;
for(var i=0; i < rules.length; i++) {
	var rule = rules[i];
	if (rule.selectorText.toLowerCase() == "element") {
		var width = rule.style.getPropertyValue("height");
	}
}