What does the Elm "stack" look like for a full application/site?

I'm trying to get an initial understanding of what a full Elm application looks like. In particular what the "stack" looks like. As a concrete example, let's say I have a website that allows users to register/login and then upload pictures and comment on others' pictures and comments. It delivers HTML, JavaScript, and CSS, and uses PHP and/or Perl on the server, The PHP/Perl interacts with MySQL or Oracle. If I were to re-develop this site with Elm, what parts does Elm handle and what are the common/recommended choices for the rest of the stack?