What is the cookie sharing mechanism?

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cookie is shared across ports?
what about different subdomains? For example, I have a.test.com and b.test.com , and I can also get cookie and b.test.com in the a.test.com setting. Empty it?

Front-end javascript cookie cookies

Mar.17,2021

demain is set to primary domain .com (codeshelper.com), then different subdomains can be obtained.

cookie there is something called domain

https://blog.csdn.net/zhouziy.

There are two types of sharing of

cookie: path and domain

path (directory sharing) a.com/a | a.com/b
domain (subdomain name sharing) a.a.com | b.a.com

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