Get list of Css class use in the HTML file

get-list-class-css.js

function getListClassCss() {
	let list = [];
	let selectorsAll = document.querySelectorAll("[class]");

	selectorsAll.forEach((event) => {
		let selectorClassAll = event.getAttribute("class").split(" ");

		selectorClassAll.forEach(
			(classCss) => {
				if (classCss.length > 0 && list.indexOf(classCss) < 0) {
					list.push(classCss)
				};
			}
		);
	});

	let listOrdered = list.sort();
	return listOrdered;
}

let listClassCss = getListClassCss();
console.info(listClassCss);