摘要：在使用截圖時，遇上無法加載，導致了截圖是空白區。否則無法直接修改的設置。

在使用 selenium + chromeDriver + python3 截圖時，遇上 Flash 無法加載，導致了截圖 Falsh 是空白區。

環境要求：selenium chromeDriver Python3

chrome 無頭瀏覽器無法自動加載 Flash

參考了 allow-flash-content-in-chrome-69-running-via-chromedriver 的回答，直接修改 Chrome 的設置 chrome://settings/content/siteDetails?site= 里面的 Flash 設置，修改為 Allow

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import Select

class chromeDriver():

    def __init__(self, driver = ""):
        # 設置窗口大小
        self.window_width  = 1680
        self.window_height = 948
        # 設置 chromedriver 位置
        self.executable_path = "/usr/local/bin/chromedriver"
        # 設置 Flash 的路徑
        self.flash_path     = "/Users/cindy/Library/Application Support/Google/Chrome/PepperFlash/32.0.0.171/PepperFlashPlayer.plugin"
        # 獲取 driver
        if driver: self.driver = driver
        else:
            self.driver = self.get_chrome_driver()
        

    def get_chrome_driver(self):
        # 頭部
        user_agent         = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36"
        # 創建參數對象
        options         = webdriver.ChromeOptions()

        prefs = {
            # 開啟圖片
            "profile.managed_default_content_settings.images":1,
            # 關閉 Notification
            "profile.default_content_setting_values.notifications": 2,
        }

        # 設置 Flash 的路徑
        options.add_argument("--ppapi-flash-version=32.0.0.171")
        options.add_argument("--ppapi-flash-path=" + self.flash_path)
        options.add_argument("binary_location=/Applications/Google Chrome.app/Contents/MacOS/Google Chrome")
        # 指定屏幕分辨率
        options.add_argument("window-size=" + str(self.window_width) + "x" + str(self.window_height) + """)
        # 最大化窗口
        options.add_argument("--start-maximized")
        # 規避bug
        options.add_argument("--disable-gpu")
        # 禁用彈出攔截
        options.add_argument("--disable-popup-blocking")
        # 隱藏自動軟件
        options.add_argument("disable-infobars")
        # 設置中文
        options.add_argument("lang=zh_CN.UTF-8")
        #忽略 Chrome 瀏覽器證書錯誤報警提示
        options.add_argument("--ignore-certificate-errors")
        # 更換頭部
        options.add_argument("user-agent=" + user_agent)
        options.add_argument("no-default-browser-check")
        # 關閉特征變量
        options.add_experimental_option("excludeSwitches", ["enable-automation"])
        options.add_experimental_option("prefs", prefs)
        # 創建 Chrome 對象
        driver     = webdriver.Chrome(options = options, executable_path = self.executable_path)

        return driver

    def get(self, web_url):
        if not web_url: return False
        return     self.driver.get(web_url)

    def add_flash_site(self, web_url):
        if not web_url: return False
        self.get("chrome://settings/content/siteDetails?site=" + web_url)
        root1 = self.driver.find_element(By.TAG_NAME, "settings-ui")
        shadow_root1 = self.expand_root_element(root1)
        root2 = shadow_root1.find_element(By.ID, "container")
        root3 = root2.find_element(By.ID, "main")
        shadow_root3 = self.expand_root_element(root3)
        shadow_root3 = self.expand_root_element(root3)
        root4 = shadow_root3.find_element(By.CLASS_NAME, "showing-subpage")
        shadow_root4 = self.expand_root_element(root4)
        root5 = shadow_root4.find_element(By.ID, "advancedPage")
        root6 = root5.find_element(By.TAG_NAME, "settings-privacy-page")
        shadow_root6 = self.expand_root_element(root6)
        root7 = shadow_root6.find_element(By.ID, "pages")
        root8 = root7.find_element(By.TAG_NAME, "settings-subpage")
        root9 = root8.find_element(By.TAG_NAME, "site-details")
        shadow_root9 = self.expand_root_element(root9)
        root10 = shadow_root9.find_element(By.ID, "plugins")
        shadow_root10 = self.expand_root_element(root10)
        root11 = shadow_root10.find_element(By.ID, "permission")
        Select(root11).select_by_value("allow")

    def expand_root_element(self, element):
        return self.driver.execute_script("return arguments[0].shadowRoot", element)


    def get_flash_url(self, web_url):
        if not web_url: return False
        self.add_flash_site(web_url)
        self.get(web_url)

    def quit_driver(self):
        self.driver.quit()



driver = chromeDriver()
url = "http://your.website/"
driver.get_flash_url(url)

不能使用無界面模式，不能設置 handless 參數 options.add_argument("--headless")。否則無法直接修改 Chrome 的設置。