{
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                "Cylinders"
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                "stack_count_Origin2"
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                {
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                    "order": "ascending"
                }
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        },
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                    "field": "stack_count_Origin1"
                },
                {
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                    "field": "stack_count_Origin2"
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            ],
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            "frame": [
                null,
                null
            ]
        },
        {
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            "offset": "normalize",
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            ],
            "stack": "count_*"
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    ],
    "mark": "rect",
    "data": {
        "url": "https://vega.github.io/vega-lite/data/cars.json"
    },
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "encoding": {
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        },
        "color": {
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            "type": "nominal"
        },
        "opacity": {
            "field": "Cylinders",
            "type": "quantitative",
            "legend": null
        },
        "tooltip": [
            {
                "field": "Origin",
                "type": "nominal"
            },
            {
                "field": "Cylinders",
                "type": "quantitative"
            }
        ],
        "x": {
            "field": "x",
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            "axis": null
        },
        "y2": {
            "field": "y2"
        },
        "y": {
            "field": "y",
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        }
    }
}