This test scrolls the page with extended backgrounds enabled 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".


Scrolled to -123, -234
JSON.stringify(layoutViewport) is {"x":-123,"y":-234,"width":800,"height":600,"top":-234,"right":677,"bottom":366,"left":-123}
JSON.stringify(visualViewport) is {"x":-123,"y":-234,"width":800,"height":600,"top":-234,"right":677,"bottom":366,"left":-123}

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

Scrolled to 1800, 1850
JSON.stringify(layoutViewport) is {"x":1800,"y":1850,"width":800,"height":600,"top":1850,"right":2600,"bottom":2450,"left":1800}
JSON.stringify(visualViewport) is {"x":1800,"y":1850,"width":800,"height":600,"top":1850,"right":2600,"bottom":2450,"left":1800}
PASS successfullyParsed is true

TEST COMPLETE