Javascript + iframe help needed

I see something similar there, but not quite what I'm after. Let me simply the problem as much as possible...


 


Starting a new Lectora file with 1 page, I add a variable "MyVar" set initially to 0.


I add an action to the page:
On: show
Action: Modify Variable
Target: MyVar
Value:
Modification Type: Add to Variable


I have a simple external HTML object:


And when I run in browser I get the alert box saying "[object Object]".


If I change the javascript to "alert(VarMyVar.value)" it changes to "undefined".


What am I missing?

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