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The depth of the scoring tree, i.e. the branches of the tree that will highlight the best explanatory variables for a score
Key values meaning in Iframe
ref = if In Iframe, it is consulted page, if not in Iframe, it is previous page seen
url = encodeURIComponent(document.URL); so actual url
http_referer it is HTTP_REFERER so should be previous page....except if code/tag is in Iframe ...
request_url is supposed to use parameter d.d