Visual viewport position, dimensions, and scale.
Height (CSS pixels), excludes scrollbar if present.
Width (CSS pixels), excludes scrollbar if present.
Horizontal offset relative to the layout viewport (CSS pixels).
Vertical offset relative to the layout viewport (CSS pixels).
Horizontal offset relative to the document (CSS pixels).
Vertical offset relative to the document (CSS pixels).
Scale relative to the ideal viewport (size at width=device-width).
Page zoom factor (CSS to device independent pixels ratio).