Just a note that sometimes the browser alert messages are completely useless and contribute to bad user experience.
Like this one.
I wanted to export data. Yes, I am sure.
It is just a line of code in javascript that remained there since initial testings obviously.
If there is any logic to it, please explain in the alert :
Oh, export is normally useless. Are you really sure you want to export data that you most probably don't really need?).
:)