Requires the site to polyfill the IntersectionObserver API (v1) to find when a bid is viewable. This implementation assumes that the publisher and the bidder are acting in good faith, and does not attempt to detect any bad behavior from either party. We assume that the ad is rendered into the element it has been told to render into, and is not hidden or obfuscated at any time.
This event is fired when an impression becomes viewable, according to IAB’s viewability guidelines
When a rendered PBJS bid is determined to be viewable this module will trigger a BID_VIEWABLE event, which can be consumed by the winning bidder and analytics adapters
The module works with Banner creatives, with additional support to come.
This feature is not intended to be a perfect measure of viewability. It is however intended to be a reasonable approximation of a bids viewability for creative types that are supported.