JSFiddle - React, Tailwind, and code Playground

HTML

<div>sfdsfsdfds</div>

JavaScript

preventBackspace();
    
    function preventBackspace() {
        try {
            if (window.addEventListener) {
                window.addEventListener("keydown", onKeyDown, true);
            } else if (window.attachEvent) { // IE 
                alert(window);
                window.attachEvent("onkeydown", onKeyDown);
            } else {
                document.addEventListener("keydown", onKeyDown, true);
            }
            } catch (e) {
                alert(e);
        }
    }
    
    function onKeyDown(e) {
        alert("test!");
        console.log("test");
    }