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Recently Viewed Expiration of cookie variable.

* The default: the cookie expires when the user closes the
browser, that is, the cookie is "session only".
* A date or date/time object (for example, 10/09/97)
* A number of days (for example, 10, or 100)
* now: deletes cookie from client cookie.txt file
(but does not delete the corresponding variable the
Cookie scope of the active page).
* never: The cookie expires in 30 years from the time it
was created (effectively never in web years). Domain in which cookie is valid and to which cookie content
can be sent from the user's system. By default, the cookie
is only available to the server that set it. Use this
attribute to make the cookie available to other servers.

Must start with a period. If the value is a subdomain, the
valid domain is all domain names that end with this string.
This attribute sets the available subdomains on the site
upon which the cookie can be used. CF 2018+ Tells browsers when and how to fire cookies in first-
or third-party situations. SameSite is used to
identify whether or not to allow a cookie to be
accessed. Values:

strict

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