asp:Textbox off focus?
OnBlur :) <asp:TextBox runat="server" onblur="alert(1);" /> (I can't recall, off the top of my head, if it will write any unknown server property to the client, I think it does, but if it doesn't, you'll need to add it as an attribute, in code). -- Edit: Confirmed that it does, indeed, happily write out unknown properties (onblur is not a property of TextBox control, but it will render in the HTML, so it works).
A multiline textbox should render to a textarea element. Assign an event handler to its onBlur event, and you should be good.
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