func UnregisterIframe(iframeID string) error {
	if _, ok := cardRegistry[iframeID]; !ok {
		return errors.New("iframe not registered")
	}
	delete(cardRegistry, iframeID)
	return nil
}
// UnregisterIframe unregisters the iframe. This should be called whenever
// the iframe is removed from the DOM. Any Respond functions corresponding
// to this iframe will be invalidated.
UnregisterIframe unregisters the iframe. This should be called whenever
the iframe is removed from the DOM. Any Respond functions corresponding
to this iframe will be invalidated.
// UnregisterIframe unregisters the iframe . This should be called whenever // the iframe is removed from the DOM . Any Respond functions corresponding // to this iframe will be invalidated .
func UnregisterIframe(iframeID string) error {
	if _, ok := cardRegistry[iframeID]; !ok {
		return errors.New("iframe not registered")
	}
	delete(cardRegistry, iframeID)
	return nil
}
func UnregisterIframe ( iframeID string ) error { if _ , ok := cardRegistry [ iframeID ] ; ! ok { return errors . New ( " " ) } delete ( cardRegistry , iframeID ) return nil }
UnregisterIframe unregisters the iframe.
UnregisterIframe unregisters the iframe .