close method
The Window.close() method closes the current window, or
the window on which it was called.
This method can only be called on windows that were opened by a script
using the
Window.open method, or on top-level windows that have a single history
entry. If the window doesn't match these requirements, an error
similar to this one appears in the console:
Scripts may not close windows that were not opened by script.
Note also that close() has no effect when called on Window
objects returned by
HTMLIFrameElement.contentWindow.
Implementation
external void close();