The humble Close button (×)

The popular Close button, ×, originated from the NeXT operating system's GUI back in the early ’90s.

Here is a screenshot from Tim Berners-Lee’s article on the WorldWideWeb browser. The WorldWideWeb was the world’s first web browser and editor.

At the time, the "X" close box was unique to NeXT, before Windows copied it. The broken X in the "Tim's home page" window means that the document has been edited and not yet saved. (A "dirty" flag). As a convenience, pressing Command/Shift/S would save back all modified web pages.
Tim Berners-Lee, WorldWideWeb browser


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