Element contextual_links_placeholder

contextual_links_placeholder =>

array:7 [
  "class" => "Drupal\contextual\Element\ContextualLinksPlaceholder"
  "provider" => "contextual"
  "id" => "contextual_links_placeholder"
  "#pre_render" => array:1 [
    0 => array:2 [
      0 => "Drupal\contextual\Element\ContextualLinksPlaceholder"
      1 => "preRenderPlaceholder"
    ]
  ]
  "#id" => null
  "#type" => "contextual_links_placeholder"
  "#defaults_loaded" => true
]