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domain of type DOMString, readonlyThe domain name of the server that served the document, or null if the server cannot be identified by a domain name.
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In the DOM HTML specification, this property is listed as being read-only. However, all common browsers including Mozilla will let you set it to a superdomain of the current value. For example, on developer.mozilla.org it is possible to set it to "mozilla.org" but not "mozilla.com".
It is not universally possible in all browsers to set document.domain to a top-level domain (such as "com" or "org") or to a subdomain of a domain on which registrations are restricted (e.g. "co.uk", as registrations on the "uk" domain are restricted).
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