Nitpick: strictly speaking setting cookies is not part of ECMAScript, it's part ...

billyhoffman · on May 5, 2015

Cookies are, without a doubt, the worst "API" in the DOM. Here's the entire API: document.cookie

That's it. That one property.To add cookies, modified cookies, delete cookies, whatever, you do an assignment. To read all the cookies, you do a read.

That's it. That's the API.

sarciszewski · on May 5, 2015

This is correct, and it's a source of madness.

One more thing: Cookies are limited to 4KB total due to the HTTP/1.1 specification.