List all class selectors from stylesheets - (Paste in console)

get_classes

var cssRules = [];
var selectors = [];
var classes = [];
var results = [];

// Get all selectors from all styleSheets that aren't undefined
for(var i = 0; i < document.styleSheets.length; i++) {
	for(var j = 0; j < document.styleSheets[i].cssRules.length; j++) {
		if(typeof document.styleSheets[i].cssRules[j].selectorText !== 'undefined') {
			cssRules.push(document.styleSheets[i].cssRules[j].selectorText);
		}
	}
}

// Get all classes from selectors
for(i = 0; i < cssRules.length; i++) {
	var selectorList = cssRules[i].split(', ');
	for(var j = 0; j < selectorList.length; j++) {
		if(selectorList[j].indexOf('.') === 0) {
			selectors.push(selectorList[j]);
		}
	}
}

// Split out nested selectors, remove selectors that contain ::before and ::after
for(i = 0; i < selectors.length; i++) {
	var selectorList = selectors[i].split(' ');
	for(var j = 0; j < selectorList.length; j++) {
		if(selectorList[j].indexOf('.') === 0) {
			if(selectorList[j].indexOf(':') === -1) {
				classes.push(selectorList[j]);
			}
		}
	}
}

classes.sort();

function uniq(a) {
    var seen = {};
    var out = [];
    var len = a.length;
    var j = 0;
    for(var i = 0; i < len; i++) {
         var item = a[i];
         if(seen[item] !== 1) {
               seen[item] = 1;
               out[j++] = item;
         }
    }
    return out;
}

results = uniq(classes);
console.log(results);