SEO Tip #113: Does Google Support Cross-Domain Rel Canonical?
Matt Cutts: Great question. Whenever rel canonical was first introduced we wanted to be a little careful. We didn’t want to open it up for potential abuse so you could only use rel canonical within one domain. The only exception to that was you could do between IP addresses and domains.
But over time we didn’t see people abusing it a lot and if you think about it, if some evil
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