2014
easyXDM - Cross-domain messaging made easy
easyXDM is a Javascript library that enables you as a developer to easily work around the limitation set in place by the Same Origin Policy, in turn making it easy to communicate and expose javascript API’s across domain boundaries.
Porthole by ternarylabs
Porthole is a small Javascript library that makes it safe and easy to communicate with cross domain iFrames. Porthole relies on hidden iFrames (later referred to a as proxy) to exchange information. The caller sets a url fragment with the message to pass. The proxy by virtue of being served from the same origin as the callee, invokes a callback method with an event object that contains the message read from the url fragment. The message signaling mechanism is based on a resize event.
2009
Official Google Webmaster Central Blog: Handling legitimate cross-domain content duplication
For some sites, there are legitimate reasons to duplicate content across different websites — for instance, to migrate to a new domain name using a web server that cannot create server-side redirects. To help with issues that arise on such sites, we're announcing our support of the cross-domain rel="canonical" link element.
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