src/modal.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <title></title>
        <meta charset="UTF-8">
        <style>
            body {
                margin: 0;
            }
        </style>
    </head>
    <body>
        <script>
            function getParameterByName(name, url) {
                if (!url) url = window.location.href;
                name = name.replace(/[\[\]]/g, "\\$&");
                var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
                    results = regex.exec(url);
                if (!results) return null;
                if (!results[2]) return '';
                return decodeURIComponent(results[2].replace(/\+/g, " "));
            }

            var imageUrl = getParameterByName('url');
            var image = document.createElement("img");
            image.id = "id";
            image.className = "class";
            image.src = imageUrl;            // image.src = "IMAGE URL/PATH"
            document.body.appendChild(image);
        </script>
    </body>
</html>