Gmail contextual gadget

Question

I guess question one is - is it actually possible to create a contextual gadget for gmail right now?

I have spent the last 2 days solid reading the (very out of date

Answer 1

Finally got it working. The problem was hosting/linking to the gadget on google drive. With the exact example above, I ftp'd the gadget to my website and linked to it there, and it all started working.

This however is a really annoying way to work, and I have seen a lot of other examples that claimed to use a document on google drive, so is there a proper way to use google drive to host a gadget during development?