CreateElement update

function ce(type, attributes, ...content) {
    const result = document.createElement(type);

    Object.entries(attributes || {})
        .forEach(([attribute, value]) => {
            if (isEventListener(attribute)) {
                result.addEventListener(attribute.substring(2).toLocaleLowerCase(), value);
            } else {
                result[attribute] = value;
            }
        });

    content = content.reduce((a, c) => a.concat(Array.isArray(c) ? c : [c]), []);

    content.forEach(e => {
        if (isElement(e)) {
            result.appendChild(e);
        } else {
            const node = document.createTextNode(e);
            result.appendChild(node);
        }
    });

    return result;

    function isEventListener(attr) {
        return attr.substring(0, 2).localeCompare('on') === 0;
    }

    function isElement(element) {
        return typeof element != 'string' && typeof element != 'number';
    }
}