In order to stop a page loading from selenium in chrome, you will need to set the pageLoadStrategy to none. You will also need to wait for the element to be present and call window.stop to stop the loading.
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
capa = DesiredCapabilities.CHROME
capa["pageLoadStrategy"] = "none"
driver = webdriver.Chrome(desired_capabilities=capa)
wait = WebDriverWait(driver, 20)
driver.get('http://xyz.com/')
wait.until(EC.presence_of_element_located((By.CSS_SELECTOR, '#h-top-questions')))
driver.execute_script("window.stop();")
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