Service render_placeholder_generator detail

Computed Definition =>

array:4 [
  "class" => "Drupal\Core\Render\PlaceholderGenerator"
  "arguments" => {#1571
    +"type": "collection"
    +"value": array:2 [
      0 => {#1569
        +"type": "service"
        +"id": "cache_contexts_manager"
        +"invalidBehavior": 1
      }
      1 => {#1568
        +"type": "parameter"
        +"name": "renderer.config"
      }
    ]
  }
  "arguments_count" => 2
  "alias" => "Drupal\Core\Render\PlaceholderGeneratorInterface"
]

Instance =>

Drupal\Core\Render\PlaceholderGenerator {#1498
  #cacheContextsManager: Drupal\Core\Cache\Context\CacheContextsManager {#49
    #container: Drupal\Core\DependencyInjection\Container {#40 …7}
    #contexts: array:27 [
      0 => "cookies"
      1 => "headers"
      2 => "ip"
      3 => "languages"
      4 => "layout_builder_is_active"
      5 => "protocol_version"
      6 => "request_format"
      7 => "route"
      8 => "route.menu_active_trails"
      9 => "route.name"
      10 => "route.name.is_layout_builder_ui"
      11 => "session"
      12 => "session.exists"
      13 => "theme"
      14 => "timezone"
      15 => "url"
      16 => "url.path"
      17 => "url.path.is_front"
      18 => "url.path.parent"
      19 => "url.query_args"
      20 => "url.query_args.pagers"
      21 => "url.site"
      22 => "user"
      23 => "user.is_super_user"
      24 => "user.node_grants"
      25 => "user.permissions"
      26 => "user.roles"
    ]
    #validContextTokens: array:28 [
      "cookies" => 0
      "headers" => 1
      "ip" => 2
      "languages" => 3
      "layout_builder_is_active" => 4
      "protocol_version" => 5
      "request_format" => 6
      "route" => 7
      "route.menu_active_trails" => 8
      "route.name" => 9
      "route.name.is_layout_builder_ui" => 10
      "session" => 11
      "session.exists" => 12
      "theme" => 13
      "timezone" => 14
      "url" => 15
      "url.path" => 16
      "url.path.is_front" => 17
      "url.path.parent" => 18
      "url.query_args" => 19
      "url.query_args.pagers" => 20
      "url.site" => 21
      "user" => 22
      "user.is_super_user" => 23
      "user.node_grants" => 24
      "user.permissions" => 25
      "user.roles" => 26
      "languages:language_interface" => true
    ]
  }
  #rendererConfig: array:2 [
    "required_cache_contexts" => array:3 [
      0 => "languages:language_interface"
      1 => "theme"
      2 => "user.permissions"
    ]
    "auto_placeholder_conditions" => array:3 [
      "max-age" => 0
      "contexts" => array:2 [
        0 => "session"
        1 => "user"
      ]
      "tags" => []
    ]
  ]
}