Add animation saving to 'Test Web Font'

Hello

I have been using the ‘Test Web Font’ page to record animated demos of my variable fonts using screen capture or by recording with my phone. These demos are used as product images in our store, and as social media content.

However I found out it’s possible to add animation export functionality using Javascript. So how about making it possible to save the animation to WebM or WebP video?

If you want to see what that looks like, I have it working here:

The javascript code is there for how to do it.