$ polymer serve
Starting Polyserve...
serving on port: 8080
from root: C:\_projects\polymer-first-elements
Files in this directory are available under the following URLs
applications: http://localhost:8080
reusable components: http://localhost:8080/components/icon-toggle/
Where I run:
navigate to http://localhost:8080/components/icon-toggle/ the screen shows "Not found"