def close(self):
self.driver.close_window(self.handle)<EOL>
Close window.

If this method was called for the window that is current, then after calling this method
future invocations of other Capybara methods should raise
``session.driver.no_such_window_error`` until another window is switched to.

If this method was called for a window that is not current, then after calling this method
the current window should remain the same as it was before calling this method.