This test scrolls the page and checks that the layout and visual viewports respond as expected.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


JSON.stringify(internals.layoutViewportRect()) is {"x":0,"y":0,"width":800,"height":600,"top":0,"right":800,"bottom":600,"left":0}
JSON.stringify(internals.visualViewportRect()) is {"x":0,"y":0,"width":800,"height":600,"top":0,"right":800,"bottom":600,"left":0}

Scrolled to 475, 525
JSON.stringify(internals.layoutViewportRect()) is {"x":475,"y":525,"width":800,"height":600,"top":525,"right":1275,"bottom":1125,"left":475}
JSON.stringify(internals.visualViewportRect()) is {"x":475,"y":525,"width":800,"height":600,"top":525,"right":1275,"bottom":1125,"left":475}

Scrolled to 100, 776
JSON.stringify(internals.layoutViewportRect()) is {"x":100,"y":776,"width":800,"height":600,"top":776,"right":900,"bottom":1376,"left":100}
JSON.stringify(internals.visualViewportRect()) is {"x":100,"y":776,"width":800,"height":600,"top":776,"right":900,"bottom":1376,"left":100}

Scrolled to 50, 300
JSON.stringify(internals.layoutViewportRect()) is {"x":50,"y":300,"width":800,"height":600,"top":300,"right":850,"bottom":900,"left":50}
JSON.stringify(internals.visualViewportRect()) is {"x":50,"y":300,"width":800,"height":600,"top":300,"right":850,"bottom":900,"left":50}
PASS successfullyParsed is true

TEST COMPLETE