DOMHTMLInputElement::rectOnScreen() returns the rect with the window, not within the screen.
Created attachment 43198 [details] patch
Comment on attachment 43198 [details] patch r=me How do you test this? Is there a way to test it with a manual test?
A manual test could test this, but it would only work in Safari. We don't seem to have a good way to test our bindings. Thanks for the review!
Landed in r51090.