IAB Standard Display Leaderboard ad specs

728×90 px. Desktop banner across the top or bottom of a page.

Pending verification. These values haven't been confirmed against the official source yet. Check the source before trafficking.

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IAB Standard Display Leaderboard ad specs
Sizes	728×90 (Standard) 1456×180 (2x retina, served at standard size)
Aspect ratio	8.09:1
Creative types	image, animated-image, html5
File formats	jpg, png, gif, html5
Max file size	Being verified
HTML5 initial load	Being verified
HTML5 subload	Being verified