Get all CSS attributes for an element.

get_css.js

var getCss = function(el) {
    var style = window.getComputedStyle(el);
    return Object.keys(style).reduce(function(acc, k) {
        var name = style[k],
            value = style.getPropertyValue(name);
        if (value !== null) {
            acc[name] = value;
        }
        return acc;
    }, {});
};