Convert styling rules of an element into inline styling

cssInliner.js

function cssInliner(el) {
    var cssProperties = getComputedStyle(el, null);
    var cssText = '';
    for (var i = 0; i < cssProperties.length; i++) {
        cssText += cssProperties[i] + ':' + cssProperties.getPropertyValue(cssProperties[i]) + ';'
    }

    el.style.cssText = cssText;

    for (var j = 0; j < el.childElementCount; j++) {
        cssInliner(el.children[j]);
    }
}