Before rotation
layoutViewport: 0, 0 - 320 x 548
visualViewport: 0, 0 - 320 x 548
client rect of fixed object:0, 0 - 320 x 548

In resize event handler:
layoutViewport: 0, 0 - 568 x 320
visualViewport: 0, 0 - 568 x 320
client rect of fixed object:100, 50 - 443 x 195

After rotation
layoutViewport: 0, 0 - 568 x 320
visualViewport: 0, 0 - 568 x 320
client rect of fixed object:100, 50 - 443 x 195