prepareElement (obj, el) {
      Object.keys(obj).forEach(prop => {
        let sh = (this.shorthand[prop] || prop)
        if (sh.match(/(body|undo|replace)/g)) return
        if (sh === 'inner') {
          el.textContent = obj[prop]
          return
        }
        el.setAttribute(sh, obj[prop])
      })
      return el
    }
Set attributes in element
@type {Function}
@param  {Object} obj
@param  {HTMLElement} el
@return {HTMLElement} with defined attributes