{
    "height": 400,
    "data": {
        "url": "https://vega.github.io/vega-lite/data/stocks.csv",
        "format": {
            "parse": {
                "date": "date"
            }
        }
    },
    "width": 800,
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "layer": [
        {
            "layer": [
                {
                    "mark": "line"
                },
                {
                    "mark": "point",
                    "selection": {
                        "myTooltip": {
                            "nearest": true,
                            "empty": "none",
                            "encodings": [
                                "x"
                            ],
                            "type": "single",
                            "on": "mouseover"
                        }
                    },
                    "encoding": {
                        "opacity": {
                            "value": 0,
                            "condition": {
                                "value": 1,
                                "selection": "myTooltip"
                            }
                        }
                    }
                }
            ],
            "encoding": {
                "color": {
                    "field": "symbol",
                    "type": "nominal"
                },
                "x": {
                    "field": "date",
                    "type": "temporal"
                },
                "y": {
                    "field": "price",
                    "type": "quantitative"
                }
            }
        },
        {
            "transform": [
                {
                    "filter": {
                        "selection": "myTooltip"
                    }
                }
            ],
            "layer": [
                {
                    "mark": {
                        "color": "gray",
                        "type": "rule"
                    },
                    "encoding": {
                        "x": {
                            "field": "date",
                            "type": "temporal"
                        }
                    }
                },
                {
                    "mark": {
                        "dx": 5,
                        "dy": -5,
                        "align": "left",
                        "type": "text"
                    },
                    "encoding": {
                        "color": {
                            "field": "symbol",
                            "type": "nominal"
                        },
                        "text": {
                            "field": "price",
                            "type": "quantitative"
                        },
                        "x": {
                            "field": "date",
                            "type": "temporal"
                        },
                        "y": {
                            "field": "price",
                            "type": "quantitative"
                        }
                    }
                }
            ]
        }
    ],
    "description": "Displays tooltips for all stock prices of the hovered time"
}