求助，selenium drag_and_drop不生效
i用selenium drag_and_drop模拟鼠标拖拽动作，拖拽动作没生效，代码运行无报错
请专家帮忙看下代码哪里有问题：
html:
http://www.jb51.net/w3school/tiy/t.asp-f=html5_global_draggable.htm
python代码:
if __name__=='__main__':
from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains
fbrowser=webdriver.Firefox()
fbrowser.get("file:///D:/python_study/test/test.html")
source=fbrowser.find_element_by_id('div1')
des=fbrowser.find_element_by_id('drag1')
ActionChains(fbrowser).drag_and_drop(source,des).perform()
软件版本信息：
firefox 45.0.1
selenium 2.53.0
页:
[1]
