If we have a custome-element.html, why no custom-element.php with its own go function?

A special case for the ServiceContainer could provide an HTMLElement already referencing the correct element.

This is how remix does it: https://remix.run/ - a custom element like <invoice-item> can have its view in invoice-item.html and logic in invoice-item.php - the go function will need to know what invoice is being referenced.

Two ideas on how to solve this:

1. Use the dynamic path as before.
2. Bind an attribute to the custom element, like an ID, from the page's go function.