Element textarea

textarea =>

array:14 [
  "class" => "Drupal\Core\Render\Element\Textarea"
  "provider" => "core"
  "id" => "textarea"
  "#input" => true
  "#cols" => 60
  "#rows" => 5
  "#resizable" => "vertical"
  "#process" => array:2 [
    0 => array:2 [
      0 => "Drupal\Core\Render\Element\Textarea"
      1 => "processAjaxForm"
    ]
    1 => array:2 [
      0 => "Drupal\Core\Render\Element\Textarea"
      1 => "processGroup"
    ]
  ]
  "#pre_render" => array:1 [
    0 => array:2 [
      0 => "Drupal\Core\Render\Element\Textarea"
      1 => "preRenderGroup"
    ]
  ]
  "#theme" => "textarea"
  "#theme_wrappers" => array:1 [
    0 => "form_element"
  ]
  "#value_callback" => array:2 [
    0 => "Drupal\Core\Render\Element\Textarea"
    1 => "valueCallback"
  ]
  "#type" => "textarea"
  "#defaults_loaded" => true
]