Android Question problem with webview "javascript"

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    Private WebView1 As WebView
    Private WebViewExtra As WebViewExtras
    Private WebViewClient As DefaultWebViewClient
    Private WebViewChrome As DefaultWebChromeClient
End Sub

Public Sub Initialize
'    B4XPages.GetManager.LogEvents = True
End Sub

'This event will be called once, before the page becomes visible.
Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
    WebViewExtra.Initialize(WebView1)
    WebViewClient.Initialize("WebViewClient")
    WebViewExtra.SetWebViewClient(WebViewClient)
    WebViewChrome.Initialize("WebViewChrome")
    WebViewExtra.SetWebChromeClient(WebViewChrome)
    WebView1.LoadUrl("https://darling-syrniki-098ddf.netlify.app/")
End Sub

Private Sub WebViewClient_ReceivedError(ErrorCode As Int, Description As String, FailingUrl As String)
    Log(ErrorCode & ", " & Description & ", " & FailingUrl)
End Sub