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The issue with the HTML code for INITIAL CHAT FRIENDS LIST is NOT published by facebook.
Facebook does NOT explain HOW their HTML code was designed to work.
Nor will they tell you if you ask them.
Speculation is all you will EVER get from ANYBODY ANYWHERE.....unless they are on the network ops team at Facebook......and even then.......departments are compartmentalized to keep anyone person from knowing too much.
Yes, zuckerburg is extremelt paranoid.
Keep in mind,in the begingin of FB, it was a scandal as to WHO owned the source code, and who developped it.
Honestly, your guess is as good as anybody else's