Gets all CSS classes in stylesheets and puts them into array Vanilla JS

GetClasses.js

let cssArray = [];

for (var i = 0; i < document.styleSheets.length; i++) {
    var styleSheet = document.styleSheets[i];
    for (var j = 0; j < 1; j++) {
        let cssRules = styleSheet.cssRules;
        for (var n = 0; n < cssRules.length; n++) {
            cssArray.push(cssRules[n].selectorText);
        }

    }
}

console.log(cssArray + ' CSS Rules found');