This document describes various types of web advertisements that can be used on desktop, tablet, and mobile versions of a website. For desktop, it outlines sidebar ads like 300x250, 120x300, 300x100, 120x600, 300x600 units that appear on all pages. Top banner ads like 350x90 and 728x90 run across the top. Homepage ads include 970x90, 670x90, 300x100 units. Section pages have a 670x90 leader ad. Stories feature a 728x90 above-headline banner. Mobile uses 320x50 banners and tablet uses 728x90 banners. Traffic data is provided for three sample sites.