[ddyevf635372]

Overlay is useful sometimes, however not always the best UX.

The main route of the url (example.com/page/subpage) represents the background page of the overlay.

You have two options. 1. Using further subroutes to represent the stage of the overlay if your framework supports it (Ember does) (example.com/page/subpage/form/step1). 2. Using query parans to store the state of the overlay (without the actual data of course): … subpage?overlay=form&step=1

Also breadcrumbs should always mirror the routes. Frameworks, libraries can automatically do it for you.