docstr: Run webdriver and return a screenshot
docstr_tok: ["Run","webdriver","and","return","a","screenshot"]
code: def get_screenshot(
      self, url: str, element_name: str, user: User
  ) -> bytes | None:
      """
      Run webdriver and return a screenshot
      """
  
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 2 for calling the WebDriverProxy obj's underlying member method code with example usage: obj.get_screenshot(url, element_name, user) without return types