getTextareaInput () {
    const el = document.createElement('textarea')
    el.style.marginBottom = '5px'
    el.style.fontSize = '1rem'
    el.style.fontFamily = 'monospace'
    return el
  }
Gets a textarea DOM element.

@returns {HTMLElement} The DOM element.
@see http://materializecss.com/forms.html#textarea