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The question on stackoverflow was regarding the second question. One link with two rel attributes, one invalid ("sunshine"), one nofollow. Html5 spec dictates that the second (valid nofollow) attribute must be ignored, thus leaving the link dofollow. I understand your logic with this statement, but I do not believe that you are correct in your assumption that a double no follow will leave the link as a follow. Most likely the erroneous code will leave the link completely ignored by the bots and even cause them not to crawl passed it. Can you correct the link to remove any unnecessary REL properties? one two If the second link is ignored, can this behaviour be changed by adding #foo or ?foo to the url? In this case, I would remove the first link if possible. Again, if this information is no follow, or contains duplicate links it will really cause more problems than solutions. If these links aren't on your site, but in a linking sources site, contact the webmaster and ask them for help correcting these links so that you can receive the full credit for any link juice.