DaveEmmerson

It's the 'karma' property that's undefined. Looking at the original window, it has it, so for whatever reason either parentWindow isn't that window or the karma property isn't visible to...

window.parent === window in this case. "If a window does not have a parent, its parent property is a reference to itself."

DUs having poor serialization is a pain. I've been looking at how to work around it, but didn't think about a PR to here. It's a good idea. Your use...