父查子:
print driver.find_element_by_xpath("//div[@id='parent']/div[2]").text #child
print driver.find_element_by_xpath("//div[@id='parent']/div[@id='B']").text #child
子查父:
print driver.find_element_by_xpath("//div[@id='B']/..").text #parent
定位兄弟節點:
print driver.find_element_by_xpath("//div[@id='B']/../div[1]").text #old brother
print driver.find_element_by_xpath("//div[@id='B']/../div[3]").text #litter brother