Cookies, Tokens, or JWTs? The ASP.NET Core Identity Dilemma

@andrea.chiarelli Thank you for giving this rundown of the new options! In the section about which authentication type to use, you say:

In previous versions of .NET, if you wanted to leverage the ASP.NET Core Identity built-in authentication pages in your SPA, the user experience would be disrupted.

What’s different in this new version? How do you prevent the page reload when using cookie-based authentication in a SPA?