Test page
This page loads the real addDuo tag with the official test units. Test ads are labelled, recorded and never billed. Scroll down: the last unit sits below the fold to demonstrate MRC viewability. It only counts as viewable after 50% of it has been on screen for one second.
Test banner 300×250
test-300x250 · banner · 300×250
Test leaderboard 728×90
test-728x90 · banner · 728×90
Test mobile banner 320×50
test-320x50 · banner · 320×50
Keep scrolling. The below-the-fold unit is next.
Test native 300×250
test-native · native · 300×250