code: def get_screenshot(
      self, url: str, element_name: str, user: User
  ) -> bytes | None:
      driver = self.auth(user)
      driver.set_window_size(*self._window)
      driver.get(url)
      img: bytes | None = None
      selenium_headstart = current_app.config[
          "SCREENSHOT_SELENIUM_HEADSTART"
      ]
      logger.debug("Sleeping for %i seconds", selenium_headstart)
      sleep(selenium_headstart)
  
      try:
          try:
              # page didn't load
              logger.debug(
                  "Wait for the presence of %s at url: %s",
                  element_name,
                  url,
              )
              element = WebDriverWait(
                  driver, self._screenshot_locate_wait
              ).until(
                  EC.presence_of_element_located(
                      (By.CLASS_NAME, element_name)
                  )
              )
          except TimeoutException as ex:
              logger.exception(
                  "Selenium timed out requesting url %s", url
              )
              raise ex
  
          try:
              # chart containers didn't render
              logger.debug(
                  "Wait for chart containers to draw at url: %s", url
              )
              WebDriverWait(driver, self._screenshot_locate_wait).until(
                  EC.visibility_of_all_elements_located(
                      (By.CLASS_NAME, "slice_container")
                  )
              )
          except TimeoutException as ex:
              logger.exception(
                  "Selenium timed out waiting for chart containers to draw at url %s",
                  url,
              )
              raise ex
  
          try:
              # charts took too long to load
              logger.debug(
                  "Wait for loading element of charts to be gone at url: %s",
                  url,
              )
              WebDriverWait(
                  driver, self._screenshot_load_wait
              ).until_not(
                  EC.presence_of_all_elements_located(
                      (By.CLASS_NAME, "loading")
                  )
              )
          except TimeoutException as ex:
              logger.exception(
                  "Selenium timed out waiting for charts to load at url %s",
                  url,
              )
              raise ex
  
          selenium_animation_wait = current_app.config[
              "SCREENSHOT_SELENIUM_ANIMATION_WAIT"
          ]
          logger.debug(
              "Wait %i seconds for chart animation",
              selenium_animation_wait,
          )
          sleep(selenium_animation_wait)
          logger.debug(
              "Taking a PNG screenshot of url %s as user %s",
              url,
              user.username,
          )
  
          if current_app.config["SCREENSHOT_REPLACE_UNEXPECTED_ERRORS"]:
              unexpected_errors = (
                  WebDriverSelenium.find_unexpected_errors(driver)
              )
              if unexpected_errors:
                  logger.warning(
                      "%i errors found in the screenshot. URL: %s. Errors are: %s",
                      len(unexpected_errors),
                      url,
                      unexpected_errors,
                  )
  
          img = element.screenshot_as_png
      except TimeoutException:
          # raise again for the finally block, but handled above
          pass
      except StaleElementReferenceException:
          logger.exception(
              "Selenium got a stale element while requesting url %s",
              url,
          )
      except WebDriverException:
          logger.exception(
              "Encountered an unexpected error when requesting url %s",
              url,
          )
      finally:
          self.destroy(
              driver, current_app.config["SCREENSHOT_SELENIUM_RETRIES"]
          )
      return img
  
imports: from __future__ import annotations
  import logging
  from abc import ABC, abstractmethod
  from enum import Enum
  from time import sleep
  from typing import Any, TYPE_CHECKING
  from flask import current_app
  from selenium.common.exceptions import StaleElementReferenceException, TimeoutException, WebDriverException
  from selenium.webdriver import chrome, firefox, FirefoxProfile
  from selenium.webdriver.common.by import By
  from selenium.webdriver.remote.webdriver import WebDriver
  from selenium.webdriver.support import expected_conditions
  from selenium.webdriver.support.ui import WebDriverWait
  from superset import feature_flag_manager
  from superset.extensions import machine_auth_provider_factory
  from superset.utils.retries import retry_call
label_desc: Use image node_id 5 for calling the WebDriverSelenium obj's underlying member method code with example usage: obj.get_screenshot(url, element_name, user) and returns: img