Selenium - MoveTargetOutOfBoundsException with Firefox

I think the correct answer here got lucky that the element they were looking for happened to be at the bottom of the page and didn't really explain why this occurs in Firefox commonly.

Browsers other than Firefox treat Webdrivers move_to_element action as scroll to part of page with element then hover over it. Firefox seems to have taken a hardline stance that move_to_element is just hover and are waiting for a scroll action to fix this.

For now you have to workaround this bug using javascript as mentioned in previous answer, but I suggest using something like this instead of arbitrarily (well I guess the example was a footer) scrolling to bottom of page and hoping object is still in view.

    def scroll_shim(passed_in_driver, object):        x = object.location['x']        y = object.location['y']        scroll_by_coord = 'window.scrollTo(%s,%s);' % (            x,            y        )        scroll_nav_out_of_way = 'window.scrollBy(0, -120);'        passed_in_driver.execute_script(scroll_by_coord)        passed_in_driver.execute_script(scroll_nav_out_of_way)

Then later

source_element = driver.find_element_by_xpath('//*[@id="footer"]/div/ul/li[1]/a')if 'firefox' in driver.capabilities['browserName']:    scroll_shim(driver, source_element)# scroll_shim is just scrolling it into view, you still need to hover over it to click using an action chain.actions = ActionChains(driver)actions.move_to_element(source_element)actions.click()actions.perform()

This error...

selenium.common.exceptions.MoveTargetOutOfBoundsException: Message: (134.96666717529297, 8682.183013916016) is out of bounds of Viewport width (1268) and height (854)

...implies that the element you are looking for is not within the Viewport. We need to scroll down to bring the element within the Viewport. Here is the working code:

from selenium import webdriverfrom selenium.webdriver.firefox.firefox_binary import FirefoxBinaryfrom selenium.webdriver.common.desired_capabilities import DesiredCapabilitiesfrom selenium.webdriver.common.action_chains import ActionChainsbinary = FirefoxBinary('C:\\Program Files\\Mozilla Firefox\\firefox.exe')caps = DesiredCapabilities().FIREFOXcaps["marionette"] = Truedriver = webdriver.Firefox(capabilities=caps, firefox_binary=binary, executable_path="C:\\Utility\\BrowserDrivers\\geckodriver.exe")driver.get("https://stackoverflow.com")last_height = driver.execute_script("return document.body.scrollHeight")driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")source_element = driver.find_element_by_xpath('//*[@id="footer"]/div/ul/li[1]/a')ActionChains(driver).move_to_element(source_element).perform()

Let me know if this Answers your Question.

You can try below while automating the script in Firefox when it usually throws MoveTargetOutOfBoundsException error:

One can transform/Zoom-in or out by

driver.execute_script("document.body.style.transform='scale(0.9)';")

Sometimes if you are running automation script in Jenkins(CI tools), you might also face the issue from above transform code where content of browser is scaled out not the actual browser, in those condition you can try out to resize the browser window:

driver.set_window_size(x, y)

or

driver.set_window_size(2000, 694)