Method child

src/component/element.js:129–138

(arg)

  */

  child(arg) {
    let ele = arg;
    if (typeof arg === 'string') {
      ele = document.createTextNode(arg);
    } else if (arg instanceof Element) {
      ele = arg.el;
    }
    this.el.appendChild(ele);
    return this;
  }

  contains(ele) {
    return this.el.contains(ele);