This is a canonicalization type question, so I believe it should be a pretty straightforward answer. I just haven't had much experience with using the canonical tag so I felt I should ask so I don't blow up my site 
Ok, let's say I have a product page that is at:
- www.exampledomain.com/products/nameofproduct
Now on that page I have an option to see all of the specs of the product in a collapsible tab which I want to link to from other pages - So the URL to this tab ends from other pages ends up being:
- www.exampledomain.com/products/nameofproduct?=productspecs
This will link to the tab and default it to open when someone clicks that link on another page.
Correct me if I'm wrong, but if I understand canonicalization correctly I believe creating this link is going to cause a duplicate page that has the opportunity to be indexed and detract from our SEO to the main product page.
My question is... where do I put the "rel=canonical" tag to point the SEO value back to the main page since the page is dynamically generated and doesn't have its own file on the server? - or do even need to be concerned with this?
Feel free to correct me if I'm wrong on any of the above. Like I said - this is something I am fairly familiar with how it works, but I haven't had much experience with using.
Thanks!