class_docstr: An imported stylesheet that's appended to the ``<head>`` element.
  
  .. note::
      A stylesheet will be appended only once, regardless of how
      many times it's being used in other models.
code: def __init__(self, *args, **kwargs) -> None:
      super().__init__(*args, **kwargs)
  
imports: from __future__ import annotations
  import logging
  from ..core.has_props import abstract
  from ..core.properties import Nullable, Required, String
  from ..model import Model
label_desc: Use image node_id 1 to create a new GlobalImportedStyleSheet object from inherited base classes: ImportedStyleSheet with example: obj = GlobalImportedStyleSheet()