simple-query-selector

el1.addClass('one').addClass('two').removeClass('three').toggleClass('f', 's');
// example-1 one two f
// example-1 one two s

let child = el1.qs('.example-1_item');

});

let elements = qsa('.example-2');
elements.each((element, i) => {
let childs = element.qsa('.example-2_item');
});

elements.ael('click', (event, element, i) => {

elements.addClass('multiple');

elements.removeClass('multiple-2');

elements.attr('attr-1', 'value')

});