| 摘要 |
Methods, systems and apparatus for determining impressions of advertisements placed on rendered web pages displayed in a viewport of a mobile device. An impression is determined to have occurred if a display of an advertisement in the viewport exceeds certain display thresholds so that the advertisement is likely to be discernible to a user of the device. These display thresholds can include, for example, the percentage of the advertisement displayed in the viewport of the device and the zoom level of the viewport (or scale of the viewport). The display thresholds can also include the duration with which the advertisement is displayed in the viewport.
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