input: [Ad size] 970x90 [Text ads] ✓ [Display ads] ✓ [Description] 
output: Sometimes referred to as a "large leaderboard." This ad format expands to 970x415 while politely "pushing" all page elements downwards. The first user impression delivers an auto-initiated pushdown experience. All subsequent impressions deliver a user-initiated pushdown which expands via a user click. This size is ideal to showcase High-Definition content such as videos, photos, animations, and applications.