Element html_tag

html_tag =>

array:8 [
  "class" => "Drupal\Core\Render\Element\HtmlTag"
  "provider" => "core"
  "id" => "html_tag"
  "#pre_render" => array:1 [
    0 => array:2 [
      0 => "Drupal\Core\Render\Element\HtmlTag"
      1 => "preRenderHtmlTag"
    ]
  ]
  "#attributes" => []
  "#value" => null
  "#type" => "html_tag"
  "#defaults_loaded" => true
]