code: def test_tmdh002_html_allowed(test):
      test.start_server(get_app(dict(html=True)))
  
      h1_elements = test.find_elements("h1")
  
      assert len(h1_elements) == 1
      assert test.get_log_errors() == []
  
imports: import dash
  from dash.dash_table import DataTable
label_desc: Use image node_id 3 for calling a global function with example usage: test_tmdh002_html_allowed(test) without return types