Context:

1. PARENT PAGE loads an IFRAME that contains an app/plugin
2. PARENT PAGE has different domain than the IFRAME
3. PARENT PAGE and IFRAME both have installed the iframeResizer plugin -> the iframe has no scroll bar (all content is shown on parent page) - IFRAME is always resized based on its document height
4. PARENT PAGE html/js cannot be changed, only the IFRAME

Problem:

If the user is at the bottom of the IFRAME, and performs an action, how do you scroll him at the TOP OF THE IFRAME?

Solutions that DO NOT work:

1. window.scrollTo(0,0); // from iframe

2. anything with window.parent from iframe (cannot access)

3. use an anchor at top of iframe body and rewrite window.location

Solutions that do work?

1. will post one as an answer (it works, but it's weird...and not good for IE)