Selenium: Can't access cookie banner html - selenium

Question

I've been trying to access the html code of cookie banners using Selenium. For some websites, I can see the cookie banner html in the Firefox Web-Inspector, however, I cannot access it via Selenium.
For example https://faz.net. Here, driver.page_source does not contain the html code of the cookie banner and I also can't access it's elements via driver.find_elements (e.g. the "ZUSTIMMEN" - button. "zustimmen" means "to accept").
What I've tried so far:
from selenium import webdriver
driver = webdriver.Firefox()
driver.implicitly_wait(20)
driver.get("https://faz.net")
print(driver.page_source) # page source does not contain the button "ZUSTIMMEN"
print(driver.find_elements_by_xpath('//button[text()="ZUSTIMMEN"]'))
driver.execute_script("arguments[0].click();", WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, '//button[text()=ZUSTIMMEN"]'))))
What am I doing wrong?

Answer 1

That button ZUSTIMMEN is in iframe. You need to switch the driver focus to iframe like below :
driver.get("https://faz.net")
wait = WebDriverWait(driver, 10)
wait.until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR, "iframe[id^='sp_message_iframe']")))
wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, "button[title='ZUSTIMMEN']"))).click()
Imports :
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
once you are done with iframe, you can switch to default content like this :
driver.switch_to.default_content()

Answer 2

That element is inside an iframe.
You have to switch to the iframe in order to access the element.
Like this:
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
driver = webdriver.Firefox()
driver.get("https://faz.net")
WebDriverWait(driver, 10).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH,"//iframe[contains(#title,'SP')]")))
Now you can click on the cookie button in order to close it with
wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, "[title='ZUSTIMMEN']"))).click()