Window.innerScreenX and window.innerScreenY

There’s a non-standard window.mozInnerScreenX and window.mozInnerScreenY in Firefox, but no standard coming along, and no equivalent value in other browsers. window.innerScreenX and innerScreenY, giving the screen position of the page’s content, should be made available via an API as simple as the existing window.screenX and window.screenY values for the top-left corner of the window itself.