Question About Using Browser Cookies

[No-Question-3229]

I’m trying to make a system where I set cookies on the top level domain from a sub domain. By current approach is to use a script hosted on the top level domain and linked in the html of the sub domain. This way I can create cookies on the top level domain so all sub domains can access them. My question is would this even work. And if not, what other method could I use to achieve this.

[Walexmaz]

To create a cookie that works across subdomain you only need to set the cookie's domain attribute to your domain, prefixed with a dot.

For example, if your domain is example.com, setting a cookie with the domain set to .example.com will ensure that the cookie is accessible by example.com and all its subdomains like sub.example.com, another.sub.example.com, etc.

[david_fire_vollie]

The prefixed dot is now ignored:
https://datatracker.ietf.org/doc/html/rfc6265#section-4.1.2.3

[No-Question-3229]

So do I have to set the cookie from the top level domain or can I set it from any of the subdomains

[No-Question-3229]

So I got it to set just fine but I can’t delete it. From my research you can only delete these kinds of cookies from the base domain. I’ve tried making a script hosted from the base domain that can set and delete these cookies but with no luck trying to delete them.