2/18/2017 --- updated download link
This widget is a sample of how to create a "headless" widget for the Wed AppBuilder (WAB). By "headless," I mean it is invisible and it is loaded at startup. It can add new functionality to the WAB such as map tips on feature layers, modify the appearance/behavior of other widgets using Dojo's Aspect Oriented Programming techniques (aspect.before, aspect.after, aspect.around). The only limit is your imagination.
There is no live sample for this widget, as it is invisible.
I called it Anvil because the original "headless" widget I wrote is called Acme, and I wanted to stay with the