Custom HTML - Anvil login form and alerts don't work

Anvil Q&A
3

Here is a clonablle version of the app.
https://anvil.works/build#clone:JOTPEBGJMVWZGDDA=5Z4IG5E2O6F43EUVQ5C3DOHK

Landing Page form is a Startup Form. It is custom HTML page.
And there is only 1 Anvil slot -
<div anvil-slot-repeat="default" class="getstarted"> </div>

It calls client side code of the same Form

def link_login_click(self, **event_args):
    """This method is called when the link is clicked"""
    anvil.users.login_with_form(show_signup_option=True, remember_by_default=True, allow_cancel=True, allow_remembered=True)
    #alert(content=ShowQuestionnaire(item = data), title="", large=True)

Both anvil.users.login_with_form() and alert(…) don’t work.

Thank you so much! I really lost how to find the issue.
I’m trying to go step by step with manual.