code: def test_LayoutDOM_backgroud() -> None:
      obj = LayoutDOM(background="#aabbccff")
      assert obj.styles["background-color"] == "#aabbccff"
  
      obj = LayoutDOM()
      assert "background-color" not in obj.styles
      obj.background = "#aabbccff"
      assert obj.styles["background-color"] == "#aabbccff"
  
file_path: bokeh/tests/unit/bokeh/models/test_layouts__models.py
imports: from __future__ import annotations
  import pytest
  from bokeh.models import ColumnDataSource
  from bokeh.models.ui import Tooltip
  from bokeh.plotting import figure
  from bokeh.models.layouts import Row, Column, LayoutDOM, TabPanel
label_desc: Use image node_id 7 for calling a global function with example usage: test_LayoutDOM_backgroud() without return types