JSFiddle - React, Tailwind, and code Playground

JavaScript

document.onkeydown = fkey;
document.onkeypress = fkey
document.onkeyup = fkey;

var wasPressed = false;

function fkey(e){
        e = e || window.event;
       if( wasPressed ) return; 
       
        if (e.keyCode == 116) {
             alert("f5 pressed");
            wasPressed = true;
        }else {
            alert("Window closed");
        }
 }