In the 228th episode of Semantic Mastery's weekly Hump Day Hangouts, one participant asked if a canonical URL pointing to itself make it appear as a non-duplicate page.
The exact question was:
Does having a canonical url pointing to itself make it appear non-duplicate page? A site I am observing has 500 plus pages. All 500 are the exact same 300 word page, with the change in suburb. When I run a siteliner check, only a very small percentage of duplicate content appears. Most of the pages are skipped due to canonical url that points to itself. As a result I am guessing that the site doesn't appear as spam at all. It is also ranking number 1 for a ton of keywords. I can't seem to make the canonical tag work through Yoast seo. Any recommendations? Thanks a lot for replying to all these questions. I really appreciate it.