The deleted read-only property of the ExtendableCookieChangeEvent interface returns any cookies that have been deleted by the given ExtendableCookieChangeEvent instance.

An array of objects containing the deleted cookie(s). Each object contains the following properties:

name

A string containing the name of the cookie.

value

A string containing the value of the cookie.

domain

A string containing the domain of the cookie.

path

A string containing the path of the cookie.

expires

A timestamp, given as Unix time in milliseconds, containing the expiration date of the cookie.

secure

A boolean indicating whether the cookie is from a site with a secure context (HTTPS rather than HTTP).

sameSite

One of the following SameSite values:

"strict"

Cookies will only be sent in a first-party context and not be sent with requests initiated by third party websites.

"lax"

Cookies are not sent on normal cross-site subrequests (for example to load images or frames into a third party site), but are sent when a user is navigating within the origin site (i.e. when following a link).

"none"

Cookies will be sent in all contexts.

In this example when the cookie is deleted the event listener logs the first item in the deleted property to the console. It contains an object representing the cookie that has just been deleted.

self.addEventListener("cookiechange", (event) => {
  console.log(event.deleted[0]);
});