aka:JavaScript:EventModel

• ECMA262 doesn't define any event model including event loops.
• Each host environment its own event model.
• Event loops are popular.
  • On both the browser and the server, JavaScript’s de-facto concurrency model is increasingly “shared nothing” communicating event loops. JavaScript event loops within the browser (both frames and workers) send asynchronous messages to other JavaScript event loops via postMessage.
  • JavaScript event loops in the browser send and receive asynchronous messages with servers using asynchronous XHR, and shortly, Server-Sent Events and WebSockets.
  • Server-side JavaScript has a rapidly growing role as the counter party of these protocols, and increasingly uses event loops to service them.