How online learning reshaped the classroom
This is a sample publisher article. The blocks below are real ad slots — each runs its own header-bidding auction, renders the winning creative, and refreshes on a viewability-gated 30-second timer.
Header bidding runs a parallel auction: every demand partner is asked to bid at the same time, the highest bid above the floor wins, and only that one creative renders. Many bid requests, one impression — the legitimate, higher-yield alternative to a waterfall.
Watch the live auction panel on the right: bids stream in per partner, the winner is marked, and the price flows to revenue. Scroll a slot out of view and its refresh timer pauses.
In production this same setup uses real Prebid.js with your bidder accounts and GPT/GAM for ad serving. The auction logic, ad-unit config, and event flow here mirror Prebid 1:1 so the swap is a configuration change.