Web VR and Mixed Reality - What Are You Most Excited About at the Moment?

Comlink by the Chrome team allows you to expose an API through post message. It means we can make APIs that work entirely in the client side without touching the network. Common Link library is really powerful with this great effect of being able to use JavaScript in minimal code. I want to continue working in the web until I'm in my 80s and I think the web should stick around.