To detect if the user is closing the IE browser apart from onunload event, as it is triggerred when user does refresh etc
11878
Identifying Between Refresh And Close Browser Actions
102569
When a user closes a , hide that  on all site pages
43780
How to detect when the mouse leaves the form?
92533
handling window close button in wpf MVVM
112863
How to detect Safari, Chrome, IE, Firefox and Opera browser?
36909
How to capture the browser window close event?
44115
IE must close for event with jQuery to work
119854
How to pop up an alert box when the browser's refresh button is clicked?
88943
How can I close a browser window without receiving the "Do you want to close this window" prompt?
96896
How to delete a localStorage item when the browser window/tab is closed?
22047
How to detect the end of loading of UITableView
94799
How does browser know how much page has been loaded?
30789
Window close events in a winforms application
75967
Can you use Javascript to detect a file download window created server side?
32860
How can I detect when the mouse leaves the window?
51025
How to prevent closing browser window?
95237
Fired an event in asp.net when Session expired or browser close