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This page measures the default zoom factors and layout viewport dimensions without any meta viewport tag.
Zoom in as much as you can, then hit Recalculate. Then zoom out as much as you can and hit Recalculate. Then change the device orientation and repeat.
Current orientation: landscape
Current layout viewport width: 1280
Current visual viewport width: 1280
Current zoom factor: 1.0
Layout viewport portrait:
Dips viewport portrait: 720
Minimum visual viewport:
Layout viewport landscape: 1280
Dips viewport landscape: 1280
Minimum visual viewport: 1000
Initial zoom factor: 1.0
Initial visual viewport width: 1280
Minimum zoom factor:
Maximum visual viewport portrait:
Maximum zoom factor:
Maximum visual viewport landscape: 1280
Minimum zoom factor: 1.0
Maximum zoom factor: 1.0