How to handle the Accept All button that appears with the page loading.

How to handle the Accept All button that appears with the page loading.

To click on Accept All button you have to induce WebDriverWait for the element_to_be_clickable() and you can use either of the following Locator Strategies:
Using java and XPATH:
new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.xpath("//button[@class='optanon-allow-all accept-cookies-button']"))).click();
Using python and CSS_SELECTOR:
WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "button.optanon-allow-all.accept-cookies-button"))).click()
Note : For python clients you have to add the following imports :
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
You can simply click "Accept All" button after page is loading.