{
    "data":[
        {
            "x": [1, 2, 3, 1, null, 4, 5, 6],
            "y": [2, 3, 2, 2, null, 3, 4, 3],
            "fill": "tonext",
            "line":{"shape": "spline"},
            "type": "scattergl"
        },
        {
            "x": [-1, 4, 9, null, 0, 1, 2],
            "y": [1, 6, 1, null, 5, 6, 5],
            "fill": "tonext",
            "type": "scattergl"
        },
        {
            "x": [6, 7, 8],
            "y": [5, 6, 5],
            "fill": "toself",
            "type": "scattergl"
        }
    ],
    "layout":{
        "title": "Fill toself and tonext",
        "width": 400,
        "height": 400
    }
}

Add fill self next test
Add fill self next test
