Get the on-screen location of web page with Selenium WebDriver

I needed a this in Robot Framework and I was inspired by Jeyabal's solution, so here is an adaptation that works for me:

${verticalWindow}=     Execute Javascript          return window.scrollY;
${verticalElement} =   Get Vertical Position       /xpath
${hasScrolled} =       Evaluate                    (${verticalElement} - ${verticalWindow}) == 0

Nothing from above worked for me. A workaround is to use window.innerHeight and window.innerWidth and work your way up from the the left, bottom corner. This assumes that the browser bottom border is almost 0 (no horizontal scrollbar or thick window decoration).

win_pos = selenium.get_window_position()
win_size = selenium.get_window_size()
win_bottom_y = win_pos['y'] + win_size['height']

# We assume viewport x == window x. For y coordinate we take the bottom
# of the browser and subtract the viewport height 
viewport_height = selenium.execute_script('return window.innerHeight')
viewport_width = selenium.execute_script('return window.innerWidth')
viewport_y = win_bottom_y - viewport_height

This is not 100% accurate but it's a good workaround that can be tweaked for your case.

SOOO many factors have to be considered to get the element position relative to the screen. For the longest time I was using the UIAutomation code above, but UIAutomation is unreliable, it crashes or fails to find the browser (for some reason), with EdgeDriver, tabs crash consistently making getting the values via UIAutomation now as a 'fallback'.

That said, when it works, the answer is GOLDEN as to the on-screen coordinates of the HTML page. However, something that always works is using javascript. So we calculate that first, then also attempt to call UIAutomation. If UIAutomation fails, we use this code's answer. If UIAutomation works, we use the UIAutomation values.

        // use javascript to get our html document location, but it's off by 2 pixels compared to uiautomation. uiautomation, however, failed so often that is was unreliable
            int outerHeight = Int32.Parse(BrowserHelper.ExecuteJavascript(browser, "return window.outerHeight"));
            int innerHeight = Int32.Parse(BrowserHelper.ExecuteJavascript(browser, "return window.innerHeight"));
            int outerWidth = Int32.Parse(BrowserHelper.ExecuteJavascript(browser, "return window.outerWidth"));
            int innerWidth = Int32.Parse(BrowserHelper.ExecuteJavascript(browser, "return window.innerWidth"));

            int browserNavHeight = outerHeight - innerHeight;
            int browserNavWidth = outerWidth - innerWidth;

            iWinLeft = browserNavWidth + 2;
            iWinTop = browserNavHeight + 2;

`