Add IE versions for api.Window.[blur/focus]_event (#13050)
Add IE versions for api.Window.[blur/focus]_event (#13050)

This PR adds real values for Internet Explorer for the `blur_event` and `focus_event` members of the `Window` API, based upon manual testing.

Test Code Used: https://developer.mozilla.org/en-US/docs/Web/API/Window/blur_event
chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data