Page.VisualViewport

{
  "id": "VisualViewport",
  "type": "object",
  "description": "Visual viewport position, dimensions, and scale.",
  "properties": [
    {
      "name": "offsetX",
      "type": "number",
      "description": "Horizontal offset relative to the layout viewport (CSS pixels)."
    },
    {
      "name": "offsetY",
      "type": "number",
      "description": "Vertical offset relative to the layout viewport (CSS pixels)."
    },
    {
      "name": "pageX",
      "type": "number",
      "description": "Horizontal offset relative to the document (CSS pixels)."
    },
    {
      "name": "pageY",
      "type": "number",
      "description": "Vertical offset relative to the document (CSS pixels)."
    },
    {
      "name": "clientWidth",
      "type": "number",
      "description": "Width (CSS pixels), excludes scrollbar if present."
    },
    {
      "name": "clientHeight",
      "type": "number",
      "description": "Height (CSS pixels), excludes scrollbar if present."
    },
    {
      "name": "scale",
      "type": "number",
      "description": "Scale relative to the ideal viewport (size at width=device-width)."
    }
  ]
}