def find_element_by_css_selector(self, css_selector):
        return self.find_element(by=By.CSS_SELECTOR, value=css_selector)
Finds element within this element's children by CSS selector.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/selenium/webdriver/remote/webelement.py/WebElement.find_element_by_css_selector