Element tableselect

tableselect =>

array:16 [
  "class" => "Drupal\Core\Render\Element\Tableselect"
  "provider" => "core"
  "id" => "tableselect"
  "#input" => true
  "#js_select" => true
  "#multiple" => true
  "#responsive" => true
  "#sticky" => false
  "#pre_render" => array:2 [
    0 => array:2 [
      0 => "Drupal\Core\Render\Element\Tableselect"
      1 => "preRenderTable"
    ]
    1 => array:2 [
      0 => "Drupal\Core\Render\Element\Tableselect"
      1 => "preRenderTableselect"
    ]
  ]
  "#process" => array:1 [
    0 => array:2 [
      0 => "Drupal\Core\Render\Element\Tableselect"
      1 => "processTableselect"
    ]
  ]
  "#options" => []
  "#empty" => ""
  "#theme" => "table__tableselect"
  "#value_callback" => array:2 [
    0 => "Drupal\Core\Render\Element\Tableselect"
    1 => "valueCallback"
  ]
  "#type" => "tableselect"
  "#defaults_loaded" => true
]