JS Zepto-style Selector

app.js

a$('div').css('color:red');
a$('p>span').css('color:red');
a$('#testElem2').html('Hello World!').css('color:red');
a$('#testElem3').html(new Date()).css('background-color:yellow').css('color:red');

lib.js

var a$ = function (selector) {
    return {
        dom: Array.prototype.slice.apply(document.querySelectorAll(selector)),
        anim: a$.anim,
        css: a$.css,
        html: a$.html
    };
};

a$.html = function (html) {
    this.dom.forEach(function (el) {
        el.innerHTML = html
    });
    return this;
};

a$.css = function (style) {
    this.dom.forEach(function (el) {
        el.style.cssText += ';' + style
    });
    return this;
};