Viewport: Size unscaled

Test Description: This test checks that window.visualViewport returns correct sizes without any pinch-zoom page scale applied.

window.visualViewport width and height is (800, 600).

window.visualViewport width and height when scrollbars are present is (800, 600).


PASS visualViewport.width should match documentElement.clientWidth when unzoomed. 
PASS visualViewport.height should match documentElement.clientHeight when unzoomed. 
PASS visualViewport.width should exclude scrollbar. 
PASS visualViewport.height should exclude scrollbar.