Repro:
http://plnkr.co/edit/aa6KVLbxWTuDTK1U3Le8?p=preview

Observed Behavior:
Type something in the input, the title rendered on the page does not update

Expected Behavior:
Type something in the input, the title should update

Additional Information
Reordering the script imports in index.html fixes/breaks this.

This example does not use web components at all, so these polyfills are fighting.

Versions
This works in the latest stable Chrome, and fails in the latest stable Firefox.