[keycloak-user] Fwd: Questions about Themes and JS Validation in the Keycloak instance

Hi, I'm new on keycloak. I need some help to understand some features, please. So, I'd like to know about themes. Would be possible to visualize the built template before deploy it, in the keycloak instance? I'd like to see it before publish. Also, I'd like to know if Can I add some javascripts validation on pages, such as 'user-profile-registration.ftl'. I searched some examples of templates, but I didn't find examples with that validation. Thanks a lot. Best regards, Celso Agra