imported/w3c/webdriver/tests/take_element_screenshot/iframe.py::test_frame_element This test draws a regular div as reference and the same div inside a borderless iframe, expecting both to be rendered equal. In both WPE/GTK MiniBrowser, both the reference and test case render the same. In the webdriver test, the iframe screenshot is offset in both x/y directions by 8 pixels. Looks like some issue converting between the element and frame rects to the client rect.