Callout Accessory Views - Sample Code - Apple Maps

<!DOCTYPE html>
<html>
<head>
<title>Callout Accessory Views</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no">
<style>

body {
    font-family: "Helvetica Neue", sans-serif;
}

#container {
    height: 600px;
}

.left-accessory-view {
    background-color: #4B93E0;
    color: #FFFFFF;
    font-size: 12px;
}

.left-accessory-view > :first-child {
    font-size: 20px;
}

.right-accessory-view {
    margin: 0 3px;
    font-size: 16px;
    text-decoration: none;
    color: #888888;
    outline: 0;
}

</style>


<script src="https://cdn.apple-mapkit.com/mk/5.x.x/mapkit.core.js"
    crossorigin async
    data-callback="initMapKit"
    data-libraries="map,annotations"
    data-token="IMPORTANT: ADD YOUR TOKEN HERE">
</script>

<script type="module">
// Wait for MapKit JS to be ready to use.
const setupMapKitJs = async() => {
    // If MapKit JS is not yet loaded...
    if (!window.mapkit || window.mapkit.loadedLibraries.length === 0) {
        // ...await <script>'s data-callback (window.initMapKit).
        await new Promise(resolve => { window.initMapKit = resolve });
        // Clean up.
        delete window.initMapKit;
    }
};

const main = async() => {
    await setupMapKitJs();

    const urlWikipedia = "https://en.wikipedia.org/wiki/San_Francisco";

    // Callout delegate
    const annotationCallout = {
        calloutLeftAccessoryForAnnotation: () => {
            const accessoryViewLeft = document.createElement("div");
            accessoryViewLeft.className = "left-accessory-view";

            const accessoryViewLeftIcon = document.createElement("span");
            accessoryViewLeftIcon.textContent = "\u{26C5}"; // Sun & Clouds
            accessoryViewLeft.appendChild(accessoryViewLeftIcon);

            const accessoryViewLeftText = document.createElement("div");
            accessoryViewLeftText.textContent = "73 \u{00b0}F";
            accessoryViewLeft.appendChild(accessoryViewLeftText);

            return accessoryViewLeft;
        },
        calloutRightAccessoryForAnnotation: () => {
            const accessoryViewRight = document.createElement("a");
            accessoryViewRight.className = "right-accessory-view";
            accessoryViewRight.href = urlWikipedia;
            accessoryViewRight.target = "_blank";
            accessoryViewRight.textContent = "\u{24D8}"; // (i) icon

            return accessoryViewRight;
        }
    };

    // Create an annotation.
    const coordinate = new mapkit.Coordinate(37.7749, -122.4194);
    const annotation = new mapkit.MarkerAnnotation(coordinate, {
        title: "San Francisco",
        subtitle: "California",
        animates: true,
        selected: true,
        color: "#4B93E0",
        callout: annotationCallout
    });

    // Create a map.
    const map = new mapkit.Map("container", { annotations: [annotation] });
};

main();

</script>

</head>
<body>
    <div id="container"></div>
</body>
</html>