As of the IAB standard - based on the IAB New Ad Portfolio - the new Flex Ads can now be used for your multi-screen campaigns.
Flex Ads are defined in Page Ratio, e.g. Flex Ad 4:1 meaning that advertising space / ad banners are displayed in high-quality resolution on any screen - without falsification or blurring. A centered and homogeneous placement within the pages' layout will surely increase the acceptance of your banner ads amongst your users as well.
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