I found a way to catch the window close event. 
 Browser.on_unload_callback() in mshtml.py catches the window close event. 
I modified Browser() class to add event handlers, and pyjd to return the 
browser object created. 

import pyjd
from pyjamas import Window

browser=pyjd.setup(url)
browser.addCloseHandler(Window.onClosing)

    
Now,  Window.addWindowCloseListener() will catch the event:


class WindowListener:
    def __init__(self):
        Window.addWindowCloseListener(self)
        Window.addWindowResizeListener(self)


The current pyjs in GitHub doesn't have pyjd installation and I tested the 
code only in the release version (pyjs0.8.1a)  You can find the code in my 
GitHub fork (https://github.com/chopin/pyjs)

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