IAB Guidelines

Ad Image Sizes

Dimensions Aspect Ratio content width % IAB Name Notes
300×250 6:5 1.2000 30.93% Medium Rectangle UAP. block ad
180×150 6:5 1.2000 ? Rectangle UAP. block ad
160×600 4:15 0.266~ ? Wide Sckyscraper UAP.
728×90 364:45 8.088~ ? Leaderboard UAP.
970×90 97:9 10.777~ 100% Super Leaderboard OAU. large leaderboard
970×66 485:33 14.696~ 100% Super Leaderboard OAU. large short leaderboard
300×600 1:2 0.5000 30.93% Half Page OAU.
120×60 2:1 2.0000 ? Button 2 OAU.
88×31 88:31 2.838~ ? Micro Bar OAU.

Z-index Guidelines

Z-Index Range Content Type Details
< 0 Background Elements
0 - 4,999 Main Content, Standard Ads Standard ad tags in place with regular content. Includes OBA Self Regulation Message (CLEAR Ad Notice)
5,000 - 1,999,999 Expanding Advertising The entire expandable ad unit should be set within this range
2,000,000 - 2,999,999 Floating Advertising Over The Page ads (OTP’s)
3,000,000 - 3,999,999 Pop-up Elements Chat windows, message notifications
4,000,000 - 4,999,999 Non-anchored Floating Elements Survey recruitment panels
5,000,000 - 5,999,999 Expanding Site Navigation Elements Drop down navigation, site warnings, etc. Only the expanding portion of navigation elements should be included on this level.
6,000,000+ Full-page Overlays Full-window Over-the-Page (OTP) ads and Between-the-Page ads IF they cover page content

Apex

OAU
Other Ad Units
UAP
Universal Ad Package