Test that scrollable areas with content that has complex containing block relationship are correctly targeted.

case 1: Scrollable 1 
case 2: Scrollable 2 
case 3: Scrollable 3 
case 4: Scrollable 4 
case 5: Scrollable 5 
case 6: Scrollable 7 
case 7: Scrollable 10 
case 8: Scrollable 11