That only works for popup windows (ones created with `window.open()`) [0]. From MDN: > This method can only be called on windows that were opened by a script

That only works for popup windows (ones created with `window.open()`) [0]. From MDN: > This method can only be called on windows that were opened by a script using the Window.open() method. I was unable to get `window.close()` to work on root windows, but your comment prompted me research it again. This seems to work: window.close('','_parent','') [0]: https://developer.mozilla.org/en-US/docs/Web/API/Window/close https://developer.mozilla.org/en-US/docs/Web/API/Window/clos...