selenium设置窗口大小不准确，终于解决

from selenium import webdriverself.browser = webdriver.Firefox()self.browser.set_window_size(1024, 768)self.browser.get_window_size()        {u'height': 638, 'value': None, u'width': 1229}

inputbox = self.browser.find_element_by_id('id_new_item')self.assertAlmostEqual(    inputbox.location['x'] + inputbox.size['width']/2,    # 512,    self.browser.get_window_size().get("width")/2,    delta=5)