US20110137733A1
patent
Systems and methods for recording impression events of Ad content on a webpage. An example method renders on a display of a computer device a webpage accessible over a network. The webpage includes at least one Adunit. Then Ad tag information associated with the at least one Ad unit and browser viewport information (display location and size information) is retrieved. The occurrence of an Ad Placement event is determined if based on the comparison a predefined percentage of the Adunit is within the browser viewport. An Ad Placement event timer is begun upon the determination of occurrence of the Ad Placement event. The Ad Placement
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