  assert_equals(document.documentElement.style.overflowY, "scroll");
    document.body.style.overflowY = "visible";
    assert_equals(document.body.style.overflowY, "visible");
    assert_equals(document.scrollingElement, document.body);

    document.documentElement.style.overflowY = "visible";
    assert_equals(document.documentElement.style.overflowY, "visible");
    assert_equals(document.scrollingElement, document.body);
}, "scrollingElement in quirks should be body if any of document and body has a vi