in case web page show alert "This site is trying to open another application." alert not shown inside WebView window (works well on chrome mobile)

page https://myhome2.cfc.io/wc/

code:

WebViewObject webViewObject;
IEnumerator StartWebView()
{
webViewObject = (new GameObject("WebViewObject")).AddComponent();
webViewObject.Init(
cb: (msg) =>
{
Debug.Log(string.Format("CallFromJS[{0}]", msg));
},
err: (msg) =>
{
Debug.Log(string.Format("CallOnError[{0}]", msg));
},
httpErr: (msg) =>
{
Debug.Log(string.Format("CallOnHttpError[{0}]", msg));
},
started: (msg) =>
{
Debug.Log(string.Format("CallOnStarted[{0}]", msg));
},
hooked: (msg) =>
{
Debug.Log(string.Format("CallOnHooked[{0}]", msg));
},
cookies: (msg) =>
{
Debug.Log(string.Format("CallOnCookies[{0}]", msg));
},
ld: (msg) =>
{
Debug.Log(string.Format("CallOnLoaded[{0}]", msg));
#if UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX || UNITY_IOS
// NOTE: the following js definition is required only for UIWebView; if
// enabledWKWebView is true and runtime has WKWebView, Unity.call is defined
// directly by the native plugin.
#if true
var js = @"
if (!(window.webkit && window.webkit.messageHandlers)) {
window.Unity = {
call: function(msg) {
window.location = 'unity:' + msg;
}
};
}
";
#else
// NOTE: depending on the situation, you might prefer this 'iframe' approach.
// cf. https://github.com/gree/unity-webview/issues/189
var js = @"
if (!(window.webkit && window.webkit.messageHandlers)) {
window.Unity = {
call: function(msg) {
var iframe = document.createElement('IFRAME');
iframe.setAttribute('src', 'unity:' + msg);
document.documentElement.appendChild(iframe);
iframe.parentNode.removeChild(iframe);
iframe = null;
}
};
}
";
#endif
#elif UNITY_WEBPLAYER || UNITY_WEBGL
var js = @"
window.Unity = {
call:function(msg) {
parent.unityWebView.sendMessage('WebViewObject', msg);
}
};
";
#else
var js = "";
#endif
webViewObject.EvaluateJS(js + @"Unity.call('ua=' + navigator.userAgent)");
},
//transparent: false,
//zoom: true,
//ua: "custom user agent string",
//radius: 0, // rounded corner radius in pixel
//// android
//androidForceDarkMode: 0, // 0: follow system setting, 1: force dark off, 2: force dark on
//// ios
enableWKWebView: true
//wkContentMode: 0, // 0: recommended, 1: mobile, 2: desktop
//wkAllowsLinkPreview: true,
//// editor
//separated: false
);
#if UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX
webViewObject.bitmapRefreshCycle = 1;
#endif
// cf. https://github.com/gree/unity-webview/pull/512
// Added alertDialogEnabled flag to enable/disable alert/confirm/prompt dialogs. by KojiNakamaru · Pull Request #512 · gree/unity-webview
webViewObject.SetAlertDialogEnabled(true);

        // cf. https://github.com/gree/unity-webview/pull/728
        //webViewObject.SetCameraAccess(true);
        //webViewObject.SetMicrophoneAccess(true);

        // cf. https://github.com/gree/unity-webview/pull/550
        // introduced SetURLPattern(..., hookPattern). by KojiNakamaru · Pull Request #550 · gree/unity-webview
        //webViewObject.SetURLPattern("", "^https://.*youtube.com", "^https://.*google.com");

        // cf. https://github.com/gree/unity-webview/pull/570
        // Add BASIC authentication feature (Android and iOS with WKWebView only) by takeh1k0 · Pull Request #570 · gree/unity-webview
        //webViewObject.SetBasicAuthInfo("id", "password");

        //webViewObject.SetScrollbarsVisibility(true);

        webViewObject.SetMargins(5, 100, 5, 100);// Screen.height / 50);
        webViewObject.SetTextZoom(100);  // android only. cf. https://stackoverflow.com/questions/21647641/android-webview-set-font-size-system-default/47017410#47017410
        webViewObject.SetVisibility(true);
        webViewObject.LoadURL("https://myhome2.cfc.io/wc/");

        yield break;

Start by reproducing https://myhome2.cfc.io/wc/ with the shown WebViewObject.Init, SetAlertDialogEnabled(true), and LoadURL calls, comparing the result with Chrome mobile. Inspect the platform-specific WebView handling for alerts and attempts to open another application; done means the alert appears inside the WebView window as expected.