这篇内容讨论了实际用户代理（浏览器）对Cookie数量和大小的限制。通常，浏览器应尽量存储常用Cookie，至少能存储300个Cookie，每个Cookie不超过4096字节，并且每个主机或域名下可存储至少20个Cookie。这确保了网站功能的正常运行，同时也关注了用户隐私和存储效率。
6.3 Implementation Limits
Practical user agent implementations have limits on the number and
size of cookies that they can store. In general, user agents’ cookie
support should have no fixed limits. They should strive to store as
many frequently-used cookies as possible. Furthermore, general-use
user agents should provide each of the following minimum capabilities
individually, although not necessarily simultaneously:
at least 300 cookies
at least 4096 bytes per cookie (as measured by the size of the
characters that comprise the cookie non-terminal in the syntax
description of the Set-Cookie header)
at least 20 cookies per unique host or domain name
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