This unit will appear at the very top of your sidebar. It will render as either a 300x250 or a 300x600.

The Leaderboard and Top Sidebar ads are the only two ads that we sell as “above the fold” and they’re also the only two ads that will load when your site loads, to increase your site’s speed. Everything else is “lazy loaded” - meaning it won’t try to load until a user scrolls near it.

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