Start with a Rails app with authentication via Persona, Foundation CSS

app/assets/javascripts/application.js

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+// This is a manifest file that'll be compiled into application.js, which will include all the files
+// listed below.
+//
+// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
+// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
+//
+// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
+// compiled file.
+//
+// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
+// about supported directives.
+//
+//= require jquery
+//= require jquery_ujs
+//= require foundation
+//= require turbolinks
+//= require_tree .
+
+$(function(){ $(document).foundation(); });
+
+$('[data-persona-login]').click(function(e) {
+  e.preventDefault();
+  navigator.id.get(function(assertion) {
+    if (assertion) {
+      if (assertion) {
+        var form = $('#browser-id-form');
+        form.find('input[name=assertion]').val(assertion);
+        form.submit();
+      } else {
+        // TODO: Handle failure
+      }
+    }
+  });
+});

app/assets/javascripts/sessions.js.coffee

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+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/