content: from dash import Dash
  from dash.dcc import Dropdown
  from dash.html import Div
  from dash.dash_table import DataTable
  
  import pytest
  
  
  @pytest.mark.DCC788
  def test_ddvi001_fixed_table(dash_duo):
      app = Dash(__name__)
      app.layout = Div(
          [
              Dropdown(
                  id="dropdown",
                  options=[
                      {"label": "New York City", "value": "NYC"},
                      {"label": "Montreal", "value": "MTL"},
                      {"label": "San Francisco", "value": "SF"},
                  ],
                  value="NYC",
              ),
              DataTable(
                  id="table",
                  columns=[
                      {"name": x, "id": x, "selectable": True} for x in ["a", "b", "c"]
                  ],
                  editable=True,
                  row_deletable=True,
                  fixed_rows=dict(headers=True),
                  fixed_columns=dict(headers=True),
                  data=[
                      {"a": "a" + str(x), "b": "b" + str(x), "c": "c" + str(x)}
                      for x in range(0, 20)
                  ],
              ),
          ]
      )
  
      dash_duo.start_server(app)
  
      dash_duo.find_element("#dropdown").click()
      dash_duo.wait_for_element("#dropdown .Select-menu-outer")
  
      dash_duo.percy_snapshot("dcc.Dropdown dropdown overlaps table fixed rows/columns")
  
      assert dash_duo.get_logs() == []
  
  
  def test_ddvi002_maxHeight(dash_duo):
      app = Dash(__name__)
      app.layout = Div(
          [
              DataTable(),  # ensure datatable css does not override maxHeight #2529
              Dropdown([str(i) for i in range(100)], "1", id="dropdown", maxHeight=800),
          ]
      )
  
      dash_duo.start_server(app)
  
      dash_duo.find_element("#dropdown").click()
      dash_duo.wait_for_element("#dropdown .Select-menu-outer")
  
      dash_duo.percy_snapshot("dcc.Dropdown dropdown menu maxHeight 800px")
  
      assert dash_duo.get_logs() == []
  