Verify that scroll-blocks-on on the documentElement is propagated to the viewport without creating any additional layers.

{
  "bounds": [800, 600],
  "children": [
    {
      "bounds": [800, 600],
      "scrollBlocksOn": [
        "StartTouch",
        "ScrollEvent"
      ],
      "contentsOpaque": true,
      "drawsContent": true
    }
  ]
}