Ep 9: Ad sizes that earn

Mistake. A sidebar slot that accepts only one ad size.

A multi-size slot lets one ad space accept several sizes, so more ads compete.

Google lists five top-performing sizes. Three hundred by two fifty, three thirty-six by two eighty, seven twenty-eight by ninety, three hundred by six hundred, and, on mobile, three twenty by one hundred. Now, game.example’s sidebar takes three hundred by six hundred only. A buyer with just a three hundred by two fifty creative can’t bid. Allow both sizes. Say the half page bids two dollars and the rectangle bids two forty. The higher bid wins, whatever its size. One rule. Reserve space for the tallest size you allow, so the page doesn’t jump when the ad loads.

Check each slot’s size list in your ad tag. Add every size the space can fit.

Next, cookies one-oh-one, and why Chrome kept third-party cookies after all.