RudderStack

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initial is how they came to be on the site (google), referrer is how the current page was linked to, could be the same values or if they clicked a different link on the current site the referrer would be the last page

OK. So the initial referrer is stored in a cookie then?

Thanks. Also, what's the difference between url and tab_url?

If you have a canonical link page_url will be that else it will be the same as tab_url (window.location.href)

e.g one of these &lt;link rel="canonical" href="<http://www.example.com/product.html>" /&gt;