This phantomjs-based tool loads a Web-page and logs on the standard output any URL (one per line) the page requests while loading that is not a www.w3.org URL (as defined in the whitelisted_domains variable).
It is meant to become a component of a new streamlined W3C publication workflow.
Running
phantomjs --ssl-protocol=tlsv1 detect-phantom.js http://example.org/page/to/be/checked [whitelist.txt]
whitelist.txt is an optional file containing URIs (one per line) that are deemed OK