【WebView×Unity】Unity側から引数を与えてWeb側の関数を実行したい

参照リンクをみながら実行したんですが、アラート出ずわからない状況です。
このwebviewを利用した方でわかる方いらっしゃいますでしょうか？

html
1<!DOCTYPE html>
2<html>
3<head>
4    <title>webview</title>
5    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />s
6</head>
7<body>
8    <form name="mainForm" action="./mypage.php" method="POST">
9        <input id="name" type="text" name="name">
10        <input id="pass" type="password" name="pass">
11        <input id="login" type="submit" value="ログイン">
12    </form>
13    <button id="test">テスト</button>
14    <script type="text/javascript">
15        // Unity.call("load");
16            Unity.appLogin = function(data) {
17                alert(data);
18            }
19</body>
20</html>

C#
1using System.Collections;
2using System.Collections.Generic;
3using UnityEngine;
4
5public class WebViewFCM : MonoBehaviour {
6
7    private string url = "デモ用のurl";
8    WebViewObject webViewObject;
9
10
11    // Use this for initialization
12    void Start()
13    {
14        webViewObject = (new GameObject("WebViewObject")).AddComponent<WebViewObject>();
15        webViewObject.Init((msg) => {
16            if (msg == "clicked")
17            {
18                webViewObject.SetVisibility(false);
19            }
20        });
21
22        webViewObject.LoadURL(url);
23        webViewObject.SetMargins(50, 100, 50, 50);
24        webViewObject.SetVisibility(true);
25
26        // iOSのみUnity側でUnity.callを定義 実行はweb側で行う
27        if (Application.platform != RuntimePlatform.Android)
28        {
29            webViewObject.EvaluateJS(
30                "window.addEventListener('load', function() {" +
31                "   window.Unity = {" +
32                "       call:function(msg) {" +
33                "           var iframe = document.createElement('IFRAME');" +
34                "           iframe.setAttribute('src', 'unity:' + msg);" +
35                "           document.documentElement.appendChild(iframe);" +
36                "           iframe.parentNode.removeChild(iframe);" +
37                "           iframe = null;" +
38                "       }" +
39                "   }" +
40                "}, false);");
41        }
42
43        webViewObject.EvaluateJS("Unity.appLogin('test');");
44
45    }
46
47    // Update is called once per frame
48    void Update()
49    {
50
51    }
52}
53