If you have ever wanted to make a fetch call as your webpage is unloading you will now that this action gets blocked by the browser.
Navigator.sendBeacon is the alternate method that addresses this need.
Code from video: https://gist.github.com/prof3ssorSt3v3/b690d1cafecd1e6471897327246bfe7e
MDN reference: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon
Browser support - https://caniuse.com/#feat=mdn-api_navigator_sendbeacon
