<html>
    <body>
        <a id="testAnchor" style="display: block; height: 100%; width: 100%" download="downloadAttributeValue.txt"></a>
        <script>
            var blob = new Blob(["Hello world!"], {type: "application/octet-stream"});
            var link = document.getElementById("testAnchor");
            link.href = window.URL.createObjectURL(blob);
        </script>
    </body>
</html>