{
  "modes": [
    {
      "writingMode": "horizontal-tb",
      "direction": "ltr",
      "sides": {
        "block-start": "top",
        "block-end": "bottom",
        "inline-start": "left",
        "inline-end": "right"
      }
    },
    {
      "writingMode": "horizontal-tb",
      "direction": "rtl",
      "sides": {
        "block-start": "top",
        "block-end": "bottom",
        "inline-start": "right",
        "inline-end": "left"
      }
    },
    {
      "writingMode": "vertical-rl",
      "direction": "ltr",
      "sides": {
        "block-start": "right",
        "block-end": "left",
        "inline-start": "top",
        "inline-end": "bottom"
      }
    },
    {
      "writingMode": "vertical-rl",
      "direction": "rtl",
      "sides": {
        "block-start": "right",
        "block-end": "left",
        "inline-start": "bottom",
        "inline-end": "top"
      }
    },
    {
      "writingMode": "vertical-lr",
      "direction": "ltr",
      "sides": {
        "block-start": "left",
        "block-end": "right",
        "inline-start": "top",
        "inline-end": "bottom"
      }
    },
    {
      "writingMode": "vertical-lr",
      "direction": "rtl",
      "sides": {
        "block-start": "left",
        "block-end": "right",
        "inline-start": "bottom",
        "inline-end": "top"
      }
    },
    {
      "writingMode": "sideways-rl",
      "direction": "ltr",
      "sides": {
        "block-start": "right",
        "block-end": "left",
        "inline-start": "top",
        "inline-end": "bottom"
      }
    },
    {
      "writingMode": "sideways-rl",
      "direction": "rtl",
      "sides": {
        "block-start": "right",
        "block-end": "left",
        "inline-start": "bottom",
        "inline-end": "top"
      }
    },
    {
      "writingMode": "sideways-lr",
      "direction": "ltr",
      "sides": {
        "block-start": "left",
        "block-end": "right",
        "inline-start": "bottom",
        "inline-end": "top"
      }
    },
    {
      "writingMode": "sideways-lr",
      "direction": "rtl",
      "sides": {
        "block-start": "left",
        "block-end": "right",
        "inline-start": "top",
        "inline-end": "bottom"
      }
    }
  ]
}