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Matt Cutts states in this video:

It turns out that as we are executing JavaScript, we do look at the attributes. So you can actually use Javascript and put, like, a nofollow attribute on individual URLs.

I'm not clear to me what the syntax for that would be. How would I put a nofollow on a link in a variable like this?

var mylink = "http://example.com/";

or if it in AJAX like this?

    type: 'post',
    url: '/path/ajax-handler/' + method,
    success: function(data) ...
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What he is referring to is the HTML markup of the page. The nofollow keyword goes into a rel attribute on a tag, usually an <a> tag with an href like so: <a href="/link" rel="nofollow">link</a>. So he is suggesting that if you don't want search engines parsing through your javascript and looking for links you can do this:

<script rel="nofollow" src="/js/code.js"></script>
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I hadn't considered that. That would be decidedly less useful than I was hoping. – Stephen Ostermiller Mar 28 '13 at 16:42

There is no attribute "rel" in <script>, therefore the following code will produce a validation error in your CSS:

<script rel="nofollow" src="/js/code.js"></script>

Does Google follow JavaScript links? Yes. http://www.adherewebdesign.com/experiment/results/

Possible solution: Edit robots.txt to include the following line:

User-agent: * Disallow: http://offending-java-url.com

This will stop all bots from following the java link.

Also, You can verify your CSS validation here: http://validator.w3.org/

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