Quickie workaround for Chrome+WebDriver full-page screenshots

full_screen.py

	def chrome_screenshot(self, filename):
		h = 1080
		w = 1920
		d = self.driver
		p_w = int(d.execute_script("return document.body.offsetWidth"))
		p_h = int(d.execute_script("return document.body.parentNode.scrollHeight"))
		b_w = int(d.execute_script("return window.innerWidth||document.documentElement.clientWidth||document.body.clientWidth||0;"))
		b_h = int(d.execute_script("return window.innerHeight||document.documentElement.clientHeight||document.body.clientHeight||0;"))
		c_w = w - p_w
		c_h = h - b_h

		d.set_window_size(p_w+c_w, p_h+c_h)
		time.sleep(0.2)
		ret = d.get_screenshot_as_file(filename)
		d.set_window_size(w,h)
		time.sleep(0.2)
		return ret

This assumes the webdriver driver has been set up and is available as self.driver.

It's an alternative to this: https://snipt.net/restrada/python-selenium-workaround-for-full-page-screenshot-using-chromedriver-2x/

it's probably going to break on something, but unlike the scroll-around-the-page method it doesn't run in to trouble with things like navbars that are glued to the top of the window.

Note that one place this can fall down is if the page you're trying to capture has an area with its height set to a proportion of the viewport. I don't encounter this very often but you may.

(The real fix is of course for Chrome to just do this correctly, but it is clear that that is never going to happen!)