I want the code to still respect ALT F4
The code should detect when the user presses ALT + F4 and perform the desired action. It should also detect when the user presses F4 alone and perform a different action.
  Of course! To allow the `ALT + F4` keyboard shortcut to work in your application while also using the `document.mouseup` event, you can use the `event.stopPropagation()` method to prevent the default behavior of the `ALT + F4` shortcut. Here's an example of how you can modify your code:
```
document.addEventListener("mouseup", function(event) {
  // Your code here
  if (event.altKey && event.key === "F4") {
    event.stopPropagation();
    // Your code to handle the ALT + F4 shortcut here
  }
});
```
By using `event.stopPropagation()`, you're preventing the `ALT + F4` shortcut from closing the window, while still allowing your code to run when the user clicks outside the element.

Alternatively, you can also use the `document.addEventListener("keydown",...)` method to listen for the `ALT + F4` keyboard shortcut directly, like this:
```
document.addEventListener("keydown", function(event) {
  if (event.altKey && event.key === "F4") {
    // Your code to handle the ALT + F4 shortcut here
  }
});
```
In this case, the `event.stopPropagation()` method