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Canonical Link Tag - When to use it and when not to!
skuba

10+ Year Member



 
Msg#: 4116056 posted 11:25 pm on Apr 14, 2010 (gmt 0)

Hi,

I would love to know your opinions on when to use or not to use canonical tags.

yes, I know they are just a "suggestion" for the SE

Not sure if you are involved in bigger sites with guided navigation, search with several facets, etc...

I am not sure whether or not to use canonical tags when users drill down by color, or size, for example.

Should all these 3 pages carry the same canonical tag?
www.domain.com/category/subcategory/blue
www.domain.com/category/subcategory/green
www.domain.com/category/subcategory/small

all use the same tag
rel=www.domain.com/category/subcategory

?



what about in this case
www.domain.com/category/subcategory/blue/show24perpage
www.domain.com/category/subcategory/blue/show-all
www.domain.com/category/subcategory/blue/show100perpage


?



When you have like 5 o 6 facets users can drill down, that can produce way too many similar pages. Yes, they will be slightly different, but in the end of the day
it's still
www.domain.com/category/subcategory

So isn't it a good idea to get all the SEO juice I can back to that URL?


What do you think?


Thanks so much

 

pavlovapete

5+ Year Member



 
Msg#: 4116056 posted 3:46 am on Apr 15, 2010 (gmt 0)

I'm not sure how the canonical system works.

Will anyone ever link to your canonical URL if it doesn't actually exist? Do the search engines consider IBLs to non-canonical URLs equivalent to links to the canonical URL?

CainIV

WebmasterWorld Senior Member 10+ Year Member



 
Msg#: 4116056 posted 5:40 am on Apr 15, 2010 (gmt 0)

Hello Skuba.

Whenever you have a product type or category type that offers any kind of variations, and those variations are expressed as new pages, the canonical tag should be used.

Additionally, if multiple pages are generated to show products in one category or one explicit type, and the result is a paginated list, the pages should be tagged.

I always use the original page as the page to reference for the canonical link tag. For example, if I have the following

/my-product/
/my-product/blue
/my-product/green
/my-product/red

Then I would setup the link canonical tag to point to the full url + /my-product/ (the other pages are only color variations)

Hope this helps

gn_wendy

5+ Year Member



 
Msg#: 4116056 posted 8:30 am on Apr 15, 2010 (gmt 0)

If you can avoid using the canonical tag - that is the best option.

If your website has pages that are identical or VERY similar (i.e. duplicate content issues) then you should really focus on removing the duplicate content. If you are using URL-parameters (to track user actions, session IDs etc.) then the optimal solution is to do that differently. Or if you are serving the same content for similar terms in product or category pages... the same applies

We have invested heavily in removing dupes and setting up 301s to the correct pages.

If your site architecture doesn't allow for the optimal solution then using canonical AND noindex tags is the next best choice.

The canonical "leaks" more linkjuice than a 301 (which will pass close to 90% of anchor and link power). Since the canonical is only a suggestion, I would always cover my bases with the noindex to avoid duplicates.

You should also try your very best to make sure bots don't crawl the duplicate URLs unnecessarily. That is to say, make sure links on your page are clean. If users decide to link to a page and they copy the "duplicate" URL - this is where the noindex and canonical will make sure that when the bot follows the copied URL link most (but not all) of the link power is passed to the correct page.

skuba

10+ Year Member



 
Msg#: 4116056 posted 5:03 pm on Apr 15, 2010 (gmt 0)

Those pages I mentioned are not duplicates. I do want them to get indexed.
Thanks

skuba

10+ Year Member



 
Msg#: 4116056 posted 5:09 pm on Apr 15, 2010 (gmt 0)

What I am trying to figure out is if in the case of a COLOR drill down or a results per page change, should I use the canonical tag to link to the parent level like I suggested on my original post?
Thanks

tedster

WebmasterWorld Senior Member tedster us a WebmasterWorld Top Contributor of All Time 10+ Year Member



 
Msg#: 4116056 posted 11:13 pm on Apr 15, 2010 (gmt 0)

You're describing "faceted navigation" which can rapidly grow the number of URLs available on your domain. You often need a lot of backlinks before Google will even think about a deep indexing like that. I even know a large site with a PR8 home page that gave up on getting all their faceted URLs indexed.

IMO you are better off aiming to get some higher level "hub pages" indexed.

[edited by: tedster at 7:26 am (utc) on Apr 16, 2010]

gn_wendy

5+ Year Member



 
Msg#: 4116056 posted 7:22 am on Apr 16, 2010 (gmt 0)

i'm with what tedster is saying.

however - to respond to the specific question:
in the case of a COLOR drill down or a results per page change, should I use the canonical tag


Just to make sure i am getting this right you have some sort of "search filter". I am going to say you sell shoes (because i need an example). If I search your page for tennis shoes i will probably land on example.com/tennis-shoes/
If I understand you correctly you send me to a new page if I only want to see red tennis shoes. Here i would not use the canonical tag. I would however probably set it to "noindex" depending on how many backlinks you have and how well you are indexed. You could always remove the noindex tag for a small subseciton and test what the effect is.
In the next example you gave us where you have /show-all and /show24perpage etc. I would use the canonical tag AND the noindex tag, because that will definately trigger a duplicate content issue. You are serving identical information for:
parts of /tennis-shoes/
and all of /tennis-shoes/red AND /tennis-shoes/red/show-all AND all other show# pages.

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