(Entry was posted by Neeraj Pandey on this post in the Dumb SEO Questions community on Facebook, 04/14/2015).

Unusual HTML 5 canonical tag

In html 5 if canonical tag is starting from ://www.xyz.com would it create any problem?? what would you suggest?

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Neeraj Pandey: In html 5 if canonical tag is starting from ://www.xyz.com would it create any problem??? what would you suggest??
Tony “Tiggerito” McCreath: Thats an invalid URL, so yes. ;

You can include relative URLs but make sure it will resolve to the URL you expect in every case. These are all valid:

http://www.xyz.com/thepage.htm
//www.xyz.com/thepage.htm
/thepage.htm

I'd personally always use full URLs to avoid mistakes.

http://googlewebmastercentral.blogspot.com.au/2013/04/5-common-mistakes-with-relcanonical.html
Neeraj Pandey: Ok Thanks Tony “Tiggerito” McCreath

View original question in the Dumb SEO Questions community on Facebook, 04/14/2015).