How to read this demo

• Left side: parent window log
• Middle: iframe containing code in this same folder & log
• Log output: Object Dumps as key:value-pairs. Item prefixed X means that property is not inherited (hasOwnProperty(k)==true)
• Normal mode
  • parent window creates object & object.__proto__
    Later, attempts to change the prototype & prints out properties
  • child window looks for its parent' object, and creates a private one sharing that same __proto__
    Later, prints out properties again to see if parent's changes came through
  Works!
• Userscript mode (Install the same code as a script)
  Same tests are run 2 seconds later. Log windows prefixed with Userscript note
  Something in the child frames' code goes wrong!
  When makeInst combines 2 perfectly sane-looking source objects,the resulting dest object does not even have the correct OwnProperties.
  Later modifying the __proto__ leads to the object forgetting its former own property altogether..
• Intended: no differenc between both results OR errors, NOT weird behaviour