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How does Ghostery detect trackers?

On the site, it says that Ghostery detects trackers by parsing the HTML on a page. However, I can't seem to find the trackers if I were to look through the source code of a page itself. For example, on CNN.com, Ghostery detects multiple trackers including Krux Digital with a URL of http://cdn.krxd.net/controltag.

I cannot find this URL myself in the source code of the site. How exactly does it work?
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