Option to show needed features in widget

[Qqwy]

I really like this API. I was looking if something like this existed, and I am very glad it does.
However, I would like to show the user a small list of the features that the site they visit needs and their browser doesn't support, since I think it is good to keep visitors informed of the reasoning behind needing to switch browser to use the site.

What I propose is something like:

"This page uses the following features:
-WebGL
-WebAudioAPI
that are unavailable in your current browser. Please view this page in one of the following browsers:"

I would like this to be added as an optional way to present the message, with an option to turn it on in the API.