Will Universal Prompt require javascript like current login?

We are using an SSLVPN client that now supports SAML workflows. When you login, a propriety browser window opens and tries to render the login page for the Identity Provider. When using Okta or Azure AD, this works fine. But when using Duo as the SSO IdP, nothing renders. I believe this is because the Duo Login page is rendered by running javascript which the SSL VPN browser does not support. Is this something that will work with the Universal Prompt or will that also require js script support to render the login page properly?