If you need to get the Y position of a vertically scrolling container, create a text box. Then on the container scroll trigger, set a variable that evaluates the numerical callback value from the event (Y position). Then add a callback that changes the text property of the text box by reading from the variable.

Internet explorer the global economy

An example of our vertical scrolling feed, with 2 expandable areas. Feel free to import into your Proto.io account.

Mobile app interactive prototype.