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5. Comparing Origins

5. Comparing Origins​

Two origins are "the same" if, and only if, they are identical. In particular:

  • If the two origins are scheme/host/port triples, the two origins are the same if, and only if, they have identical schemes, hosts, and ports.

  • An origin that is a globally unique identifier cannot be the same as an origin that is a scheme/host/port triple.

Two URIs are same-origin if their origins are the same.

NOTE: A URI is not necessarily same-origin with itself. For example, a data URI [RFC2397] is not same-origin with itself because data URIs do not use a server-based naming authority and therefore have globally unique identifiers as origins.

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