Vb.net document.getelementbyid() not working with chromium

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VB

Chromium

The new code I tried didn't seem to work so I'm looking for guidance on how my VB code setup for an IE browser can be converted to work in the Chromium browser:

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
    Value.Text = Value.Text - 1

    If Value.Text = 0 And
        WebBrowser1.DocumentText.Contains(User.Text) Then

        WebBrowser1.Document.GetElementById("msg").InnerText = R1.Text
       WebBrowser1.Document.GetElementById("submit").InvokeMember("Click")
        Value.Text = 240
        LatestActivity.Text = (DateTime.Now.ToString())

    End If
End Sub

What I have tried:

To begin I tried this, but unfortunately had no luck with it:

browser.ExecuteScriptAsync("document.GetElementById('message').InnerText;" = R1.Text)