How to scroll down in an instagram pop-up frame with Selenium

the element you're looking is //div[@class='isgrP'] and Keys.PAGE_DOWN is not work for scrollable div.

Your variable fList hold old value, you need to find again the elements after scroll.

#find all li elements in listfBody  = driver.find_element_by_xpath("//div[@class='isgrP']")scroll = 0while scroll < 5: # scroll 5 times    driver.execute_script('arguments[0].scrollTop = arguments[0].scrollTop + arguments[0].offsetHeight;', fBody)    time.sleep(tryTime)    scroll += 1fList  = driver.find_elements_by_xpath("//div[@class='isgrP']//li")print("fList len is {}".format(len(fList)))print("ended")#driver.quit()

The above code works fine if you add iteration (for) with rangefor i in range(1, 4): try:

            #find all li elements in list            fBody  = self.driver.find_element_by_xpath("//div[@class='isgrP']")            scroll = 0            while scroll < 5: # scroll 5 times                self.driver.execute_script('arguments[0].scrollTop = arguments[0].scrollTop + arguments[0].offsetHeight;', fBody)                time.sleep(2)                scroll += 1            fList  = self.driver.find_elements_by_xpath("//div[@class='isgrP']//li")            print("fList len is {}".format(len(fList)))        except Exception as e:            print(e, "canot scrol")        try:            #get tags with a            hrefs_in_view = self.driver.find_elements_by_tag_name('a')            # finding relevant hrefs            hrefs_in_view = [elem.get_attribute('title') for elem in hrefs_in_view]            [pic_hrefs.append(title) for title in hrefs_in_view if title not in pic_hrefs]            print("Check: pic href length " + str(len(pic_hrefs)))        except Exception as tag:            print(tag, "can not find tag")

So, the for loop makes it to possible scrol even if the while loop miss