debug/query-raster.html

<!DOCTYPE html>
<html>
    <head>
        <title>Mapbox GL JS debug page</title>
        <meta charset="utf-8" />
        <meta
            name="viewport"
            content="width=device-width, initial-scale=1.0, user-scalable=no"
        />
        <link rel="stylesheet" href="../dist/mapbox-gl.css" />
        <style>
            body {
                margin: 0;
                padding: 0;
            }
            html,
            body,
            #map {
                height: 100%;
            }
            #swatch {
                position: absolute;
                top: 0;
                left: 0;
                width: 100px;
                height: 100px;
            }
        </style>
    </head>

    <body>
        <div id="map"></div>
        <div id="swatch"></div>

        <script src="../dist/mapbox-gl-dev.js"></script>
        <script src="../debug/access_token_generated.js"></script>
        <script>
            var map = (window.map = new mapboxgl.Map({
                container: "map",
                zoom: 12.5,
                center: [-77.01866, 38.888],
                style: "mapbox://styles/mapbox/satellite-v9",
                hash: true,
            }));

            map.on("load", function () {

                map.on("mousemove", (event) => {
                    const pixel = map.colorForLayerPoint(
                        "satellite",
                        event.point
                    );

                    document.getElementById(
                        "swatch"
                    ).style.backgroundColor = `rgba(${pixel[0]},${pixel[1]},${pixel[2]},${pixel[3]})`;
                });
            });
        </script>
    </body>
</html>