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IE9 tracking protection list
With the release candidate of Internet Explorer 9 (IE9), Microsoft added a feature to prevent sites from tracking a user's browsing activity. Tracking protection uses a list to tell IE9 which third-party page elements to block and which to allow, and covers elements such as ads and embedded widgets.
For example, a page could include third-party ads, each with a tracking pixel, from two sites: Xyz-ads.com and Abc-analytics.com. As Xyz-ads.com is on a block list, no request is sent to its server and the space where it should appear is left blank. However, Abc.analytics.com is on an allow list, so the request to the server goes through.