code: def test_displays_placeholder(
      self, bokeh_model_page: BokehModelPage
  ) -> None:
      text_input = TextAreaInput(placeholder="placeholder")
      page = bokeh_model_page(text_input)
      el = find_element_for(page.driver, text_input, "textarea")
      assert el.get_attribute("placeholder") == "placeholder"
      assert page.has_no_console_errors()
  
file_path: bokeh/tests/integration/widgets/test_textarea_input.py
imports: from __future__ import annotations
  import pytest
  from selenium.webdriver.common.keys import Keys
  from bokeh.layouts import column
  from bokeh.models import ColumnDataSource, CustomJS, Plot, Range1d, Scatter, TextAreaInput
  from tests.support.plugins.project import BokehModelPage, BokehServerPage
  from tests.support.util.selenium import RECORD, enter_text_in_element, find_element_for
label_desc: Use image node_id 2 for calling the Test_TextInput obj's underlying member method code with example usage: obj.test_displays_placeholder(bokeh_model_page) without return types