• https://webkit.org/blog/7846/concurrent-javascript-it-can-work/
• https://medium.com/dev-channel/es6-modules-in-chrome-canary-m60-ba588dfb8ab7
• http://2ality.com/2015/01/es6-destructuring.html

async/await

• https://developers.google.com/web/fundamentals/getting-started/primers/async-functions?hl=ko
• https://developers.google.com/web/fundamentals/primers/async-functions?hl=ko

custom element

• https://www.youtube.com/watch?v=sK1ODp0nDbM

Websocket

• https://developer.mozilla.org/ko/docs/WebSockets/Writing_WebSocket_client_applications

javascript template

https://github.com/PolymerLabs/lit-html