Origin of about:blank in regards to same origin policy [closed]

Question

The same origin policy dictates two pages may share JavaScript resources if they share protocol, host and port.

What is the origin of the about:blank page in Chrome? That is, what is the protocol, host and port of the page? What pages can it share JavaScript resources with?

Answer 1

The about: scheme is considered to make for a unique origin, which disallows access to any resource - even about:blank to itself.