content: from dash import html, Dash, Input, Output
  
  
  # WARNING: dynamic callback creation can be dangerous, use at you own risk.
  # It is not intended for use in a production app, multi-user
  # or multiprocess use as it only works for a single user.
  def test_dync001_dynamic_callback(dash_duo):
      app = Dash()
  
      app.layout = html.Div(
          [
              html.Div(id="output"),
              html.Button("create", id="create"),
              html.Div("initial", id="output-2"),
              html.Button("dynamic", id="dynamic"),
          ]
      )
  
      @app.callback(
          Output("output", "children"),
          Input("create", "n_clicks"),
          _allow_dynamic_callbacks=True,
          prevent_initial_call=True,
      )
      def on_click(n_clicks):
          @app.callback(
              Output("output-2", "children"),
              Input("dynamic", "n_clicks"),
              prevent_initial_call=True,
          )
          def on_click2(n_clicks2):
              return f"Dynamic clicks {n_clicks2}"
  
          return f"creator {n_clicks}"
  
      dash_duo.start_server(app)
  
      dash_duo.wait_for_element("#dynamic").click()
      dash_duo.wait_for_element("#create").click()
      dash_duo.wait_for_text_to_equal("#output", "creator 1")
      dash_duo.wait_for_text_to_equal("#output-2", "initial")
  
      dash_duo.wait_for_element("#dynamic").click()
      dash_duo.wait_for_text_to_equal("#output-2", "Dynamic clicks 2")
  
  
  def test_dync002_dynamic_callback_without_element(dash_duo):
      app = Dash()
  
      app.layout = html.Div(
          [
              html.Button("Add callbacks", id="add-callbacks"),
              html.Div(id="output"),
          ]
      )
  
      @app.callback(
          Output("output", "children"),
          Input("add-callbacks", "n_clicks"),
          _allow_dynamic_callbacks=True,
          prevent_initial_call=True,
      )
      def on_add_callback(_):
          @app.callback(Output("no-exist", "children"), Input("invalid", "n_clicks"))
          def addition(_):
              return "additional"
  
          return html.Div("add callbacks")
  
      dash_duo.start_server(app)
  
      dash_duo.wait_for_element("#add-callbacks").click()
      dash_duo.wait_for_text_to_equal("#output", "add callbacks")
  
      assert dash_duo.get_logs() == []
  
  
  def test_dyn003_dynamic_callback_import_library(dash_duo):
      app = Dash()
      app.layout = html.Div(
          [
              html.Button("insert", id="insert"),
              html.Div(id="output"),
          ]
      )
  
      @app.callback(
          Output("output", "children"),
          Input("insert", "n_clicks"),
          _allow_dynamic_callbacks=True,
          prevent_initial_call=True,
      )
      def on_click(_):
          import dash_test_components as dt
  
          return dt.StyledComponent(
              value="inserted", id="inserted", style={"backgroundColor": "red"}
          )
  
      dash_duo.start_server(app)
  
      dash_duo.wait_for_element("#insert").click()
      dash_duo.wait_for_text_to_equal("#inserted", "inserted")
  